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Fair Value Measures (Changes in Fair Value of Contingent Earn-Out Liabilities) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Document Period End Date Dec. 31, 2018  
Balance at beginning of period $ 4,000 $ 8,648
Earn-out liabilities established at time of acquisition 0 500
Payments and foreign currency translation (21)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   17
Adjustments to fair value included in acquisition-related costs, net 0 1,300
Balance at end of period 3,979 $ 10,431
Contingent Consideration Payment, Higher End $ 11,700