Pension and Other Employee Obligations - Summary of Net Defined Benefit Liability (Asset) (Detail) $ in Thousands	12 Months Ended
Mar. 31, 2018 USD ($) yr	Mar. 31, 2017 USD ($) yr	Mar. 31, 2016 USD ($)
Disclosure of net defined benefit liability (asset) [line items]
Service cost	$ 1,917	$ 2,188	$ 1,765
Past service cost	538
Interest cost	587	451	419
Accrued pension liability
Current	1,189	770
Non-current	8,871	10,030
Net amount recognized	10,060	10,800
Fair value of plan assets	(1,041)	(976)
Net surplus (deficit) in plan	$ 9,377	$ 7,790
Weighted average duration of defined benefit obligation (both funded and unfunded) \| yr	4.8	8.3
Benefit obligations [member]
Disclosure of net defined benefit liability (asset) [line items]
Beginning of the year	$ 11,776	$ 8,450
Foreign currency translation	(118)	(30)
Service cost	1,917	2,188
Past service cost	538
Interest cost	657	513
Business combinations		95
Benefits paid	(1,160)	(1,283)
Actuarial (gain)/loss from changes in demographic assumptions	62	463
Actuarial (gain)/loss from changes in financial assumptions	(3,428)	(126)
Actuarial (gain)/loss from actual experience compared to assumptions	857	1,506
End of the year	11,101	11,776	8,450
Plan assets [member]
Disclosure of net defined benefit liability (asset) [line items]
Beginning of the year	976	849
Foreign currency translation	(5)	22
Expected return on plan assets	70	62
Actuarial (loss) /gain	(23)	39
Actual contributions	1,104	1,148
Benefits paid	(1,081)	(1,144)
End of the year	1,041	976	$ 849
Present value of funded defined benefit obligation [member]
Accrued pension liability
Present value of defined benefit obligation	10,418	8,766
Present value of unfunded defined benefit obligation [member]
Accrued pension liability
Present value of defined benefit obligation	$ 683	$ 3,010

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 141
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_ii&doctype=Standard
-URIDate 2017-03-09