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Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2020
USD ($)
Segment
$ / shares
Sep. 30, 2019
USD ($)
Segment
Sep. 30, 2018
USD ($)
Cash [Abstract]      
Cash deposit $ 250 $ 250  
Deferred Offering Costs [Abstract]      
Deferred offering costs 0 2,600  
Property and Equipment [Abstract]      
Impairment of property and equipment 0 0 $ 0
Lease Commitments [Abstract]      
Rent expense 12,400 10,100 8,000
Goodwill and Other Identifiable Intangible Assets [Abstract]      
Impairment of goodwill 0 0 0
Impairment of Identifiable Intangible assets 0 0 0
Contract Liability [Abstract]      
Beginning contract liability 4,880    
Revenue recognized from contract liabilities included in the beginning balance (4,880)    
Increases due to cash received, net of amounts recognized in revenue during the period 17,280    
Ending contract liability 17,280 4,880  
Contract Asset [Abstract]      
Contract asset 1,500    
Increase to net income from new revenue recognition standard $ 900    
Increase to basic EPS from new revenue recognition standard (in dollars per share) | $ / shares $ 0.14    
Increase to diluted EPS from new revenue recognition standard (in dollars per share) | $ / shares $ 0.14    
Advertising Costs [Abstract]      
Advertising cost $ 5,400 7,000 4,800
Net of related co-op assistance $ 700 $ 900 $ 800
Segment Reporting [Abstract]      
Number of operating segments | Segment 1 1  
Timing of Revenue [Abstract]      
Percentage on Timing of Revenue Recognition 100.00%    
Transferred at Point in Time [Member]      
Timing of Revenue [Abstract]      
Percentage on Timing of Revenue Recognition 97.00%    
Transferred over Time [Member]      
Timing of Revenue [Abstract]      
Percentage on Timing of Revenue Recognition 3.00%    
Company Vehicles [Member]      
Property and Equipment [Abstract]      
Estimated useful lives of assets 5 years    
Buildings and Improvements [Member] | Minimum [Member]      
Property and Equipment [Abstract]      
Estimated useful lives of assets 10 years    
Buildings and Improvements [Member] | Maximum [Member]      
Property and Equipment [Abstract]      
Estimated useful lives of assets 39 years    
Leasehold Improvements [Member]      
Property and Equipment [Abstract]      
Estimated useful lives of assets 15 years    
Machinery and Equipment [Member] | Minimum [Member]      
Property and Equipment [Abstract]      
Estimated useful lives of assets 5 years    
Machinery and Equipment [Member] | Maximum [Member]      
Property and Equipment [Abstract]      
Estimated useful lives of assets 7 years    
Office Equipment [Member] | Minimum [Member]      
Property and Equipment [Abstract]      
Estimated useful lives of assets 5 years    
Office Equipment [Member] | Maximum [Member]      
Property and Equipment [Abstract]      
Estimated useful lives of assets 7 years