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Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Sep. 30, 2020
USD ($)
Segment
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Accounting Policies [Abstract]      
Inventories valuation allowance $ 2,400,000 $ 2,200,000  
Goodwill and other intangible assets increased from acquisitions 20,200,000 37,000,000.0  
Goodwill and other intangible assets 84,293,000 64,077,000  
Business acquisition, goodwill for tax purposes 16,800,000 10,500,000  
Impairment charges 0    
Contract assets recorded in prepaid expenses and other current assets $ 2,600,000 2,500,000  
Revenue remaining obligation description As a practical expedient, because repair and maintenance service contracts have an original duration of one year or less, we do not consider the time value of money, and we do not disclose estimated revenue expected to be recognized in the future for performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period or when we expect to recognize such revenue.    
Contract liabilities $ 31,821,000 24,305,000  
Contract liabilities recognized in revenue 24,300,000    
Accumulated other comprehensive (loss) income 829,000 (669,000)  
Reclassified out of accumulated other comprehensive income 0    
Total advertising and promotional expenses 14,000,000.0 18,800,000 $ 16,500,000
Net of related co-op assistance $ 589,000 $ 807,000 $ 653,000
Number of reporting segment | Segment 1