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Share-based Payments - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2019 USD ($) yr $ / shares shares | Mar. 31, 2018 USD ($) yr $ / shares shares | Mar. 31, 2017 USD ($) yr $ / shares shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Number of shares available for future grants | shares | 3,303,952 |  |
Number of shares issued upon exercise of share options and RSUs | shares | 719,140 | 1,521,521 | 906,255
Total cash received from option exercised |  | $ 1,347,000 | $ 8,941,000
Share-based compensation expense | $ 30,305,000 | 30,565,000 | 23,036,000
2006 Incentive award plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Aggregate intrinsic value of options exercised | $ 0 | $ 180,000 | $ 2,697,000
Total grant date fair value of options vested | shares | 0 | 0 | 0
Total cash received from option exercised | $ 0 | $ 1,347,000 | $ 8,941,000
Number of options granted | 0 | 0 | 0
Weighted average share price of options exercised | $ 0.00 | $ 30.44 | $ 27.46
Exercise price per options outstanding | $ 0 | $ 0 |
Weighted average remaining contractual term | yr | 0 | 0 | 0.10
PSUs [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Vesting period |  | Three years |
Unrecognized compensation cost related to unvested other equity instruments | $ 7,055,000 |  |
Weighted average grant date fair value | 47.54 | $ 30.35 | $ 31.12
Aggregate intrinsic value of share units exercised | 15,077,000 | 17,737,000 | 4,237,000
Total grant date fair value of units vested | $ 9,535,000 | $ 8,696,000 | $ 6,280,000
Weighted average share price of share units exercised other equity instruments | $ / shares | $ 50.75 | $ 35.01 | $ 29.89
Number of other equity instruments issued in share-based payment arrangement | 199,303 | 400,463 |
Expected weighted average period for recognition of compensation cost other equity instruments | yr | 2.2 |  |
Share-based options [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Share-based incentive plan - term | 10 years |  |
Share-based options [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Vesting period | Four years |  |
Restricted share units (RSUs) [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Share-based incentive plan - term | 10 years |  |
Restricted share units (RSUs) [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Vesting period | Four years |  |
RSUs dependent on non-market performance condition [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Unrecognized compensation cost related to unvested other equity instruments | $ 7,276,000 |  |
Expected weighted average period for recognition of compensation cost other equity instruments | yr | 2.7 |  |
Weighted average grant date fair value | $ 47.89 | $ 30.85 | $ 30.26
Aggregate intrinsic value of share units exercised | 21,324,000 | 34,339,000 | 9,991,000
Total grant date fair value of units vested | $ 15,964,000 | $ 16,931,000 | $ 14,631,000
Weighted average share price of share units exercised other equity instruments | $ / shares | $ 50.52 | $ 35.73 | $ 29.08
Number of other equity instruments issued in share-based payment arrangement | 383,229 | 497,689 |
RSUs dependent on market performance condition [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Unrecognized compensation cost related to unvested other equity instruments | $ 103,000 |  |
Expected weighted average period for recognition of compensation cost other equity instruments | yr | 0.7 |  |
Weighted average grant date fair value | $ 0.00 | $ 0.00 | $ 12.56
Additional cost as a result of modification in respect of modified share awards | 1,185,000 |  |
Incremental cost recognized in the current year in respect of such modified RSUs | $ 540,000 | $ 540,000 |
Number of other equity instruments issued in share-based payment arrangement | 0 | 0 |
RSUs related total shareholders return [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Unrecognized compensation cost related to unvested other equity instruments | $ 4,589,000 |  |
Expected weighted average period for recognition of compensation cost other equity instruments | yr | 1.7 |  |
Weighted average grant date fair value | $ 57.20 | $ 36.52 |
Number of other equity instruments issued in share-based payment arrangement | 166,760 | 248,655 |
Share-based compensation expense | $ 2,886,000 | $ 1,368,000 |
RSUs BBBEE Program In South Africa [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Vesting period | Four years |  |
Number of other equity instruments issued in share-based payment arrangement | 14,250 | 32,050 |
Share-based compensation expense | $ 760,000 | $ 547,000 | $ 0
Unamortized Share based compensation | $ 3,040,000 |  |

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- Definition The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The exercise price of outstanding share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_d&doctype=Standard -URIDate 2018-03-16 + Details
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