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Fair Value Measures (Changes in Fair Value of Contingent Earn-Out Liabilities) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Document Period End Date     Mar. 31, 2019  
Balance at beginning of period $ 3,979 $ 10,431 $ 4,000 $ 8,648
Earn-out liabilities established at time of acquisition 0 0 0 500
Payments and foreign currency translation (2,529) (79) (2,550)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements       96
Adjustments to fair value included in acquisition-related costs, net 0 1,400 0 2,700
Balance at end of period 1,450 $ 11,752 1,450 $ 11,752
Contingent Consideration Payment, Higher End $ 9,200   $ 9,200