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Financial Instruments - Movement in Contingent Consideration Categorized Under Level 3 Fair Value Measurement (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Payouts $ 5,465  
Fair value on recurring basis [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 19,678  
Additions   $ 19,934
Payouts (7,000)  
Gain recognized in the consolidated statement of income (1,553) (279)
Finance expense recognized in the consolidated statement of income 263 23
Ending Balance $ 11,388 $ 19,678