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Share-based Payments - Movements in Number of Options Outstanding under 2006 Incentive Award Plan and Related Weighted Average Exercise Prices (Detail) - 2006 Incentive award plan [member] | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) yr | Mar. 31, 2019 USD ($) yr | Mar. 31, 2017 yr
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | 117,179 |  |
Exercised | (48,227) |  |
Lapsed | (68,952) |  |
Weighted average exercise price, Beginning balance | $ 27.25 |  |
Options exercisable |  | 0 |
Weighted average exercise price, Exercised | 7.63 |  |
Weighted average exercise price, Lapsed | 7.87 |  |
Aggregate intrinsic value, Beginning balance | $ 163,000 |  |
Weighted average exercise price, Options exercisable |  | $ 0 |
Weighted average remaining contract term (in years) | yr | 0 | 0 | 0.10
Aggregate intrinsic value, Options exercisable |  | $ 0 |
Weighted average remaining contract term (in years), Options exercisable | yr |  | 0 |

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- Definition The number of share options outstanding in a share-based payment arrangement. + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of share options exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_vii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of share options expired in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_v&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]] + 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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