Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Detail)

v3.20.2
Debt - Additional Information (Detail)
12 Months Ended
Jul. 30, 2020
USD ($)
May 01, 2020
USD ($)
Apr. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]          
Long-term debt       $ 92,850,000 $ 50,263,000
Fixed coverage ratio       2.85 4.04
Leverage ratio       1.08 0.66
Interest expense, borrowings       $ 3,600,000 $ 3,300,000
Amortization of deferred issuance costs and debt discounts       200,000 100,000
Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage 0.20%        
Remaining borrowing capacity       39,300,000 14,400,000
Letter of Credit          
Debt Instrument [Line Items]          
Debt fee rate 0.20%        
Interest rate swaps          
Debt Instrument [Line Items]          
Notional amount       46,500,000 21,500,000
Derivative assets (liabilities), at fair value, net       (1,700,000) (300,000)
BBVA Credit Agreement          
Debt Instrument [Line Items]          
Long-term debt       92,900,000 44,700,000
Minimum          
Debt Instrument [Line Items]          
Debt fee rate 0.70%        
Maximum          
Debt Instrument [Line Items]          
Debt fee rate 0.75%        
Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, periodic payment, principal   $ 1,200,000 $ 2,050,000    
Debt instrument, fee amount $ 600        
Senior Notes | BBVA Credit Agreement          
Debt Instrument [Line Items]          
Long-term debt       92,850,000 44,700,000
Line of Credit          
Debt Instrument [Line Items]          
Long-term debt       0.0 5,000,000.0
Line of Credit | BBVA Credit Agreement          
Debt Instrument [Line Items]          
Long-term debt       $ 0 $ 5,000,000
Credit Agreement          
Debt Instrument [Line Items]          
Minimum fixed coverage ratio       1.20  
Maximum consolidated coverage ratio       2.75