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Cash Flow Information - Supplemental - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Supplemental Cash Flow Elements [Abstract]
Cash payments made for interest	$ 9.0	$ 7.0
Net payments made for federal and state income taxes	$ 20.8	$ 7.3

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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