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Fair Value Measures (Changes in Fair Value of Contingent Earn-Out Liabilities) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Document Period End Date     Jun. 30, 2020  
Balance at beginning of period $ 2,493 $ 1,450 $ 2,550 $ 4,000
Payments and foreign currency translation 13 0 44  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements       2,550
Adjustments to fair value included in acquisition-related costs, net 0 (561) 0 (561)
Balance at end of period 2,506 $ 889 2,506 $ 889
Contingent Consideration Payment, Higher End $ 4,800   $ 4,800