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Business Acquisitions (Components of Acquisition-Related Costs, Net) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Document Period End Date Dec. 31, 2018  
Transition and integration costs $ 2,864 $ 4,062
Professional service fees 78 511
Acquisition-related adjustments (106) 988
Total $ 2,836 $ 5,561