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Financial Instruments - Carrying Value and Fair Value of Financial Instruments by Class (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Prepayments and other assets	$ 24,847	$ 27,385
Other non-current assets	42,388	31,944
Unamortised debt issuance cost	769	1,257
Other employee obligations	64,617	52,933
Other liabilities	15,739	16,015
Non-financial instruments [member]
Disclosure of detailed information about financial instruments [line items]
Prepayments and other assets	20,437	23,123
Other non-current assets	32,145	21,153
Unamortised debt issuance cost	769	1,257
Other employee obligations	14,892	16,912
Other liabilities	$ 13,566	$ 13,720

X

- Definition

The amount of current prepayments and other current assets. [Refer: Other current assets; Current prepayments]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of current provisions for employee benefits. [Refer: Provisions for employee benefits]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Current liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of non-current assets that the entity does not separately disclose in the same statement or note. [Refer: Non-current assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Unamortized debt issuance costs netted off with the amount of non-current borrowings.

+ References

No definition available.

+ Details

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