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Financial Instruments - Contractual Maturities of Financial Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Disclosure of maturity analysis for financial liabilities [Line Items]    
Long term debt (includes current portion) $ 89,900 $ 118,000
Trade payables 19,703 14,239
Provision and accrued expenses 28,826 27,217
Other liabilities 13,834 20,764
Other employee obligations 59,347 46,701
Derivative financial instruments 8,755 4,783
Total 220,365 231,704
Less than 1 Year [member]    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Long term debt (includes current portion) 28,100 28,100
Trade payables 19,703 14,239
Provision and accrued expenses 28,826 27,217
Other liabilities 10,680 9,338
Other employee obligations 59,347 46,701
Derivative financial instruments 6,466 3,947
Total 153,122 129,542
1-2 years [member]    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Long term debt (includes current portion) 28,200 28,100
Other liabilities 3,154 8,195
Derivative financial instruments 2,289 836
Total 33,643 37,131
2-5 years [member]    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Long term debt (includes current portion) 33,600 61,800
Other liabilities   3,231
Total $ 33,600 $ 65,031