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Financial Instruments - Summary of Net Cash Position (Parenthetical) (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
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Disclosure of detailed information about financial instruments [abstract] |  |
Unamortized debt issuance cost | $ 409 | $ 769

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- Definition Unamortized debt issuance costs. + References No definition available. + Details
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Balance Type: | debit
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