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Schedule of Deferred Stock Unit Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (benefit)	$ 21,374us-gaap_ShareBasedCompensation	$ 19,642us-gaap_ShareBasedCompensation	$ 19,416us-gaap_ShareBasedCompensation
Deferred Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (benefit)	$ (2,477)us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember	$ 1,737us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember	$ 1,085us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_DeferredCompensationShareBasedPaymentsMember

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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