XML 123 R107.htm IDEA: XBRL DOCUMENT v3.19.1

Financial Instruments - Gain/(Loss) Reclassified from Other Comprehensive Income into Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of cash flow hedges reclassified to profit/(loss)	$ 486	$ 26,436	$ 24,777
Income tax related to amounts reclassified into consolidated statement of income	(577)	(9,965)	(8,998)
Total	(91)	16,471	15,779
Revenue [member]
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of cash flow hedges reclassified to profit/(loss)	66	11,231	7,952
Foreign exchange gain/(loss), net [member]
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of cash flow hedges reclassified to profit/(loss)	(2)	15,766	16,896
Finance expense [member]
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of cash flow hedges reclassified to profit/(loss)	$ 422	$ (561)	$ (71)

X

- 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.

+ Details

Name:	ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of reclassification adjustments related to cash flow hedges, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 92
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_92&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 23
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_d&doctype=Standard&book=b
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 92
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_92&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 24C
-Subparagraph b
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_b_iv&doctype=Standard
-URIDate 2018-03-16

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 24E
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24E_a&doctype=Standard
-URIDate 2018-03-16

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 23
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_d&doctype=Standard&book=b
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Income tax relating to reclassification adjustments on cash flow hedges.

+ References

No definition available.

+ Details

Name:	wns_IncomeTaxRelatingToReclassificationAdjustmentsOnCashFlowHedges
Namespace Prefix:	wns_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	wns_IncomeStatementLocationAxis=wns_RevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	wns_IncomeStatementLocationAxis=wns_ForeignExchangeGainLossNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	wns_IncomeStatementLocationAxis=wns_FinanceExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: