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Finance Expense - Summary of Finance Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Analysis of income and expense [abstract] |  |  |
Interest expense | $ 3,266 | $ 3,215 | $ 424
(Gain)/loss on interest rate swaps | (422) | 561 | 71
Debt issue cost | 360 | 488 | 52
Total | $ 3,204 | $ 4,264 | $ 547

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- Definition The amount of costs associated with financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 82 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_82_b&doctype=Standard -URIDate 2018-03-16 + Details
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