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Indebtedness - Additional Information (Detail)
$ in Thousands, $ in Millions
12 Months Ended
Aug. 14, 2017
USD ($)
Installment
Aug. 14, 2017
SGD ($)
Installment
Jun. 30, 2019
USD ($)
Jun. 30, 2020
Sep. 30, 2019
USD ($)
Aug. 14, 2017
SGD ($)
Debt Instrument [Line Items]            
Borrowings under credit facility     $ 110,000   $ 110,000  
Payments to acquire business     $ 24,500      
Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum capacity borrowing amount under credit facility         300,000  
Borrowings under credit facility         110,000  
Maximum | Revolving Credit Facility            
Debt Instrument [Line Items]            
Additional borrowing capacity         $ 150,000  
Consolidated net leverage ratio         3.75  
Maximum | Step Down | Forecast | Revolving Credit Facility            
Debt Instrument [Line Items]            
Consolidated net leverage ratio       3.50    
Minimum | Revolving Credit Facility            
Debt Instrument [Line Items]            
Consolidated interest coverage ratio         3.00  
Decillion Solutions Pte Ltd            
Debt Instrument [Line Items]            
Payments to acquire business $ 4,600 $ 6.2        
Note payable $ 1,800         $ 2.5
Note payable, number of installments | Installment 10 10