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Retirement Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Compensation And Retirement Disclosure [Abstract]
Costs of employer matching contributions to 401(k) plan	$ 17.3	$ 16.9	$ 16.4
Period to fully vest 401(k) employer matching contributions	Two years of service from date of hire
Maximum vesting percentage of 401(k) employer matching contributions	100.00%
Amounts included in other long-term liabilities, related to the non-qualified deferred compensation plan	$ 21.1	$ 19.7

The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement.

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.