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Share Capital - Additional Information (Detail) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 30, 2018 USD ($) shares | Mar. 16, 2016 USD ($) shares | Mar. 31, 2019 USD ($) shares | Mar. 31, 2019 GBP (£) £ / shares shares | Mar. 31, 2018 USD ($) shares | Mar. 31, 2018 GBP (£) £ / shares shares | Mar. 31, 2017 USD ($) shares | Mar. 31, 2016 USD ($) shares | Mar. 31, 2019 $ / shares shares | Mar. 31, 2018 $ / shares shares | Mar. 16, 2018 £ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Authorized share capital shares |  |  |  | 60,000,000 |  | 60,000,000 |  |  | 60,000,000 | 60,000,000 |
Par value per share | (per share) |  |  |  | £ 0.10 |  | £ 0.10 |  |  | $ 0.16 | $ 0.16 |
Treasury shares [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  | 1,101,300 |  | 4,400,000 | 3,300,000 | 1,100,000 | 1,101,300 | 4,400,000 |
Number of shares cancelled |  |  | (4,400,000) | (4,400,000) |  |  |  |  |  |  |
Cancellation of treasury shares | $ |  |  | $ 134,231,000 |  |  |  |  |  |  |  |
Share capital [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  | 511,532,220 |  | 54,834,080 | 53,312,559 | 52,406,304 | 511,532,220 | 54,834,080 |
Number of shares cancelled |  |  | (4,400,000) | (4,400,000) |  |  |  |  |  |  |
Cancellation of treasury shares | $ |  |  | $ (573,000) |  |  |  |  |  |  |  |
Share premium [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Cancellation of treasury shares | $ |  |  | $ (133,658,000) |  |  |  |  |  |  |  |
Ordinary shares [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Authorized share capital amount | £ |  |  |  | £ 6,100,000 |  | £ 6,100,000 |  |  |  |  |
Authorized share capital shares |  |  |  | 60,000,000 |  | 60,000,000 |  |  | 60,000,000 | 60,000,000 |
Par value per share | £ / shares |  |  |  | £ 0.1 |  | £ 0.10 |  |  |  |  |
Number of shares outstanding |  |  |  | 50,051,920 |  | 50,434,080 |  |  | 50,051,920 | 50,434,080 |
Preference shares [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Authorized share capital shares |  |  |  | 1,000,000 |  | 1,000,000 |  |  | 1,000,000 | 1,000,000 |
Par value per share | £ / shares |  |  |  | £ 0.1 |  | £ 0.10 |  |  |  |  |
Number of shares outstanding |  |  |  | 0 |  | 0 |  |  | 0 | 0 |
American depositary shares [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Par value per share | £ / shares |  |  |  |  |  |  |  |  |  |  | £ 0.10
Number of ordinary shares represented by 1 American Depositary Shares |  | 1 |  |  |  |  |  |  |  |  |
Number of shares repurchased |  |  | 1,101,300 | 1,101,300 | 1,100,000 | 1,100,000 | 2,200,000 |  |  |  |
Shares repurchased value | $ |  |  | $ 56,362,000 |  | $ 39,546,000 |  | $ 64,224,000 |  |  |  |
Shares repurchased transaction costs | $ |  |  | 11,000 |  | $ 17,000 |  | 33,000 |  |  |  |
Share repurchase cancellation fees | $ |  |  | $ 55,000 |  |  |  | $ 111,000 | $ 55,000 |  |  |
American depositary shares [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased | 3,300,000 | 3,300,000 |  |  |  |  |  |  |  |  |
Price for repurchase of shares | $ | $ 100 | $ 50 |  |  |  |  |  |  |  |  |
Duration of share repurchase program | 36 months |  |  |  |  |  |  |  |  |  |
American depositary shares [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Price for repurchase of shares | $ | $ 10 | $ 10 |  |  |  |  |  |  |  |  |
American depositary shares [member] | Treasury shares [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares cancelled |  |  | 4,400,000 | 4,400,000 |  |  |  |  |  |  |

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