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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, 2019
Mar. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Payouts $ 6,922 $ 5,465
Fair value on recurring basis [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 11,388 19,678
Additions 0 0
Payouts (8,456) (7,000)
Gain recognized in the consolidated statement of income   (1,553)
Finance expense recognized in the consolidated statement of income 265 263
Ending Balance $ 3,197 $ 11,388