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v3.19.1

Consolidated Statements of Financial Position (Parenthetical) | Mar. 31, 2019 £ / shares shares | Mar. 31, 2019 $ / shares shares | Mar. 31, 2018 £ / shares shares | Mar. 31, 2018 $ / shares shares
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Statement of financial position [abstract] |  |  |  |
Share capital, par value | (per share) | £ 0.10 | $ 0.16 | £ 0.10 | $ 0.16
Share capital, authorized | 60,000,000 | 60,000,000 | 60,000,000 | 60,000,000
Share capital, issued | 51,153,220 | 51,153,220 | 54,834,080 | 54,834,080
Shares held in treasury, shares | 1,101,300 | 1,101,300 | 4,400,000 | 4,400,000

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- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Associates [member]; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_vi&doctype=Standard -URIDate 2018-03-16 + Details
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- References No definition available. + Details
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