Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Detail)

v3.10.0.1
Debt - Additional Information (Detail)
12 Months Ended
May 15, 2018
USD ($)
note
Jun. 30, 2017
USD ($)
Dec. 12, 2014
USD ($)
institution
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Debt Instrument [Line Items]          
Long-term debt       $ 63,264,000 $ 57,500,000
Deferred debt issuance costs       362,000 364,000
Loss on extinguishment of debt       0 1,638,000
Interest expense       2,000,000 4,100,000
Amortization of deferred issuance costs and debt discounts       100,000 700,000
Scruggs Company          
Debt Instrument [Line Items]          
Long-term debt $ 1,100,000        
Number of interest notes payable | note 3        
Estimated fair value of instrument $ 400,000        
Principal balance assumed $ 700,000        
Minimum | Scruggs Company          
Debt Instrument [Line Items]          
Interest rate, percentage 4.50%        
Maximum | Scruggs Company          
Debt Instrument [Line Items]          
Interest rate, percentage 5.95%        
Senior Notes          
Debt Instrument [Line Items]          
Assumed debt   $ 50,000,000.0      
Additional borrowing capacity $ 22,000,000.0        
Quarterly installments 3,600,000        
Long-term debt       $ 57,300,000 47,500,000
Outstanding principal and interest repaid   10,100,000      
Senior Notes | Scruggs Company          
Debt Instrument [Line Items]          
Long-term debt 22,000,000        
Senior Notes | Compass Amendment          
Debt Instrument [Line Items]          
Commitment fee       0.35%  
Fixed coverage ratio       1.20  
Leverage ratio       2.00  
Senior Notes | Compass Amendment | Interest Rate Swap          
Debt Instrument [Line Items]          
Notional amount   25,000,000      
Derivative, fixed interest rate       2.015%  
Senior Notes | Interest Rate Swap Agreement | Interest Rate Swap          
Debt Instrument [Line Items]          
Notional amount $ 11,000,000     $ 28,700,000 23,800,000
Derivative, fixed interest rate       3.01%  
Derivative assets (liabilities), at fair value       $ 300,000 $ (200,000)
Senior Notes | CIT Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity     $ 76,000,000.0    
Number of financial institutions | institution     6    
Senior Notes | CIT Term Loan          
Debt Instrument [Line Items]          
Additional borrowing capacity     $ 27,000,000.0    
Long-term debt     49,000,000    
Deferred debt issuance costs     $ 2,300,000    
Loss on extinguishment of debt   900,000      
Quarterly aggregate gross borrowings payable     3.125%    
Outstanding principal and interest repaid   32,000,000      
Senior Notes | Capitala Term Loan          
Debt Instrument [Line Items]          
Long-term debt     $ 12,500,000    
Interest rate, percentage     11.50%    
Deferred debt issuance costs     $ 1,400,000    
Loss on extinguishment of debt   700,000      
Outstanding principal and interest repaid   12,600,000      
Redemption price     100.00%    
Senior Notes | Federal Funds | Compass Amendment          
Debt Instrument [Line Items]          
Basis spread on variable rate       0.50%  
Senior Notes | Eurodollar | Compass Amendment          
Debt Instrument [Line Items]          
Basis spread on variable rate       1.00%  
Senior Notes | LIBOR | CIT Term Loan          
Debt Instrument [Line Items]          
Basis spread on variable rate     3.50%    
Senior Notes | Minimum          
Debt Instrument [Line Items]          
Interest rate, percentage         3.33%
Senior Notes | Minimum | Eurodollar | Compass Amendment          
Debt Instrument [Line Items]          
Basis spread on variable rate       2.00%  
Senior Notes | Minimum | LIBOR | Compass Amendment          
Debt Instrument [Line Items]          
Basis spread on variable rate       2.00%  
Senior Notes | Maximum          
Debt Instrument [Line Items]          
Interest rate, percentage         11.50%
Senior Notes | Maximum | Eurodollar | Compass Amendment          
Debt Instrument [Line Items]          
Basis spread on variable rate       2.25%  
Senior Notes | Maximum | LIBOR | Compass Amendment          
Debt Instrument [Line Items]          
Basis spread on variable rate       2.25%  
Compass Revolving Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 30,000,000.0      
Long-term debt       $ 5,000,000 $ 10,000,000