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Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Sep. 30, 2014 Contract | Mar. 31, 2014 Contract
Derivatives, Fair Value [Line Items] |  |
Cash equivalents maturity period, days | 90 days |
Number of contracts outstanding | 0 | 4
Notional value of foreign exchange contract |  | $ 2.3

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