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Financial Instruments and Derivative Financial Instruments - Additional Information (Detail) $ in Thousands | Mar. 31, 2018 USD ($) ForwardContract | Mar. 31, 2017 USD ($) ForwardContract
--- | --- | ---
Concentration Risk [Line Items] |  |
Letters of credit outstanding amount | $ | $ 8,233 | $ 8,372
Foreign Exchange [Member] |  |
Concentration Risk [Line Items] |  |
Number of foreign exchange contracts held by the company | ForwardContract | 0 | 0

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