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Schedule of Tax Benefit from Stock Benefit Transactions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Line Items]
Excess tax benefits on stock benefit transactions	$ (1,784)us-gaap_DeferredTaxExpenseFromStockOptionsExercised	$ 301us-gaap_DeferredTaxExpenseFromStockOptionsExercised	$ 359us-gaap_DeferredTaxExpenseFromStockOptionsExercised

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- Definition

Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907

+ Details

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