Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Detail)

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Debt - Additional Information (Detail)
1 Months Ended 7 Months Ended 12 Months Ended
May 15, 2018
USD ($)
note
Aug. 31, 2019
Jul. 31, 2019
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]            
Long-term debt       $ 50,263,000 $ 63,264,000  
Deferred debt issuance costs       263,000 362,000  
Interest expense       3,300,000 $ 2,000,000.0  
Amortization of deferred issuance costs and debt discounts       $ 100,000    
Interest Rate Swap            
Debt Instrument [Line Items]            
Notional amount $ 11,000,000.0         $ 25,000,000.0
Derivative instrument, interest rate stated percentage           0.0202
Scruggs Company            
Debt Instrument [Line Items]            
Long-term debt 1,100,000          
Estimated fair value of instrument $ 400,000          
Number of interest notes payable | note 3          
Principal balance assumed $ 700,000          
BBVA Credit Agreement            
Debt Instrument [Line Items]            
Consolidated leverage ratio   0.0200        
Percentage of principal payments in quarterly installments   0.0250 0.0500      
Commitment fee   0.20% 0.35%      
Maximum fixed coverage ratio   1.20   4.04 1.51  
Maximum consolidated coverage ratio   2.75 2.00 0.66 0.88  
LIBOR | BBVA Credit Agreement            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.20%        
Minimum | Scruggs Company            
Debt Instrument [Line Items]            
Interest rate, percentage 4.50%          
Minimum | BBVA Credit Agreement            
Debt Instrument [Line Items]            
Interest rate based on several indices plus applied mark up     0.020      
Interest rate, percentage       3.24%    
Maximum | Scruggs Company            
Debt Instrument [Line Items]            
Interest rate, percentage 5.95%          
Maximum | BBVA Credit Agreement            
Debt Instrument [Line Items]            
Interest rate based on several indices plus applied mark up     0.0225      
Interest rate, percentage         4.24%  
Maximum | LIBOR | BBVA Credit Agreement            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.70%        
Senior Notes | Interest Rate Swap            
Debt Instrument [Line Items]            
Notional amount       $ 21,500,000 $ 28,700,000  
Derivative assets (liabilities), at fair value       (300,000) 300,000  
Senior Notes | Scruggs Company            
Debt Instrument [Line Items]            
Long-term debt $ 22,000,000.0          
Senior Notes | BBVA Credit Agreement            
Debt Instrument [Line Items]            
Long-term debt       44,700,000 57,300,000  
Remaining borrowing capacity       14,400,000 14,000,000.0  
Interest rate, percentage 3.01%          
Assumed debt $ 22,000,000.0          
Line of Credit | BBVA Credit Agreement            
Debt Instrument [Line Items]            
Long-term debt       $ 5,000,000.0 $ 5,000,000