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Intrinsic Value of Options Exercised and Fair Value of Options Vested (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |
Total fair value of options vested | $ 1,266 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 |  | $ 19 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 |
Total intrinsic value of options exercised | $ 71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | [1] | $ 554 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | [1]
[1] | (a) The total intrinsic value of options exercised represents the total pre-tax intrinsic value (the difference between the stock price at exercise and the exercise price multiplied by the number of options exercised) that was received by the option holders who exercised their options during the fiscal year.

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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