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Business Combinations - Summary of Final Fair Values and Purchase Price Allocations in Aggregate of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2018
Business Acquisition [Line Items]      
Goodwill $ 244,574 $ 240,327 $ 228,436
Acquired Business      
Business Acquisition [Line Items]      
Receivables 6,887    
Inventories 2,105    
Prepaid expenses and other current assets 89    
Property and equipment, net 14,926    
Intangibles 28,599    
Accrued expenses and other current liabilities (366)    
Unearned service contract revenue (2,800)    
Customer credit balances (3,399)    
Other long-term liabilities (1,275)    
Total net identifiable assets acquired 44,766    
Total consideration 60,904    
Less: Total net identifiable assets acquired 44,766    
Goodwill $ 16,138