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Revenue - Additional Information (Detail) $ in Thousands	Apr. 01, 2018 USD ($)
Revenue [abstract]
Contract acquisition cost capitalized	$ 6,821

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- References

No definition available.

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Namespace Prefix:	ifrs-full_
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Period Type:	duration

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- Definition

Contract acquisition cost capitalized during the year.

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No definition available.

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Namespace Prefix:	wns_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration