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Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Sep. 30, 2019
USD ($)
Segment
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Oct. 01, 2018
USD ($)
Accounting Policies [Abstract]        
Inventories valuation allowance $ 2,200,000 $ 1,500,000    
Goodwill and other intangible assets increased from acquisitions 37,000,000.0 1,300,000    
Goodwill and other intangible assets 64,077,000 27,491,000    
Business acquisition, goodwill for tax purposes 10,500,000 1,300,000    
Impairment charges 0      
Contract assets recorded in prepaid expenses and other current assets $ 2,500,000     $ 2,700,000
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.      
Accumulated other comprehensive loss, net of tax $ 669,000 (0.0)    
Reclassified out of accumulated other comprehensive income 0      
Total advertising and promotional expenses 18,800,000 16,500,000 $ 16,200,000  
Net of related co-op assistance $ 807,000 $ 653,000 $ 779,000  
Number of reporting segment | Segment 1