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Financial Instruments - Contractual Maturities of Financial Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Disclosure of maturity analysis for financial liabilities [Line Items]    
Long-term debt (includes current portion) $ 61,800 $ 89,900
Trade payables 17,831 19,703
Provision and accrued expenses 27,619 28,826
Other liabilities 5,485 13,834
Other employee obligations 63,129 59,347
Derivative financial instruments 2,403 8,755
Total 178,267 220,365
Less than 1 Year [member]    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Long-term debt (includes current portion) 28,200 28,100
Trade payables 17,831 19,703
Provision and accrued expenses 27,619 28,826
Other liabilities 5,485 10,680
Other employee obligations 63,129 59,347
Derivative financial instruments 2,096 6,466
Total 144,360 153,122
1-2 years [member]    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Long-term debt (includes current portion) 16,800 28,200
Other liabilities   3,154
Derivative financial instruments 307 2,289
Total 17,107 33,643
2-5 years [member]    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Long-term debt (includes current portion) 16,800 33,600
Total $ 16,800 $ 33,600