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Business Combinations - Summary of Preliminary Fair Values and Purchase Price Allocations in Aggregate of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]    
Goodwill $ 247,341 $ 228,436
Acquired Business    
Business Acquisition [Line Items]    
Receivables 8,008  
Inventories 3,059  
Prepaid expenses and other current assets 89  
Property and equipment, net 13,097  
Intangibles 25,952  
Accrued expenses and other current liabilities (365)  
Unearned service contract revenue (2,763)  
Customer credit balances (3,150)  
Other long-term liabilities (25)  
Total net identifiable assets acquired 43,902  
Total consideration 62,807  
Less: Total net identifiable assets acquired 43,902  
Goodwill $ 18,905