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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, 2017
Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Document Period End Date Dec. 31, 2017  
Balance at beginning of period $ 8,648 $ 8,240
Earn-out liabilities established at time of acquisition 500 1,653
Payments and foreign currency translation (17)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   1,498
Adjustments to fair value included in acquisition-related costs, net 1,300 566
Balance at end of period 10,431 $ 8,961
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 25,100