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Employee Benefits - Disclosure of Reconciliation From Opening Balances to Closing Balances For Net Defined Liability and Its Components (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disclosure Of Defined Benefit Plans [Line Items]
Balance as at April 1	$ 4,834	$ 3,424
Acquired through business combination		114
Included in profit or loss
Current service cost	949	930
Past service cost		432
Interest cost (income)	245	236
Included in profit or loss, total	1,194	1,598
Included in other comprehensive income
-financial assumptions	(158)	(72)
-experience adjustment	493	314
-Return on plan assets excluding interest income	(136)	104
Included in other comprehensive income, total	199	346
Effects of movement in foreign exchange rates	110	(340)
Other
Contribution by employer	(2)	(26)
Benefits paid	(486)	(282)
Balance as at March 31	5,849	4,834
Defined Benefit Obligation [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Balance as at April 1	5,669	4,269
Acquired through business combination		281
Included in profit or loss
Current service cost	949	930
Past service cost		432
Interest cost (income)	283	302
Included in profit or loss, total	1,232	1,664
Included in other comprehensive income
-financial assumptions	(158)	(72)
-experience adjustment	493	314
Included in other comprehensive income, total	335	242
Effects of movement in foreign exchange rates	125	(406)
Other
Benefits paid	(871)	(381)
Balance as at March 31	6,490	5,669
Fair Value of Plan Assets [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Balance as at April 1	(835)	(845)
Acquired through business combination		(167)
Included in profit or loss
Interest cost (income)	(38)	(66)
Included in profit or loss, total	(38)	(66)
Included in other comprehensive income
-Return on plan assets excluding interest income	(136)	104
Included in other comprehensive income, total	(136)	104
Effects of movement in foreign exchange rates	(15)	66
Other
Contribution by employer	(2)	(26)
Benefits paid	385	99
Balance as at March 31	$ (641)	$ (835)

X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 19
-IssueDate 2020-01-01
-Paragraph 141
-Subparagraph c
-Clause iii
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- Definition

The amount of benefits paid or payable for retirement benefit plans.

+ References

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

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

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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.

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The amount of employer contributions to retirement benefit plans.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

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-Name IAS
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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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-Name IAS
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The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)]

+ References

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The (decrease)/increase in a net defined benefit liability (asset) resulting from remeasurement (gains)/losses in other comprehensive income resulting from experience adjustment.

+ References

No definition available.

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