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Commitments and Contingencies Commitments and Contingencies (Insurance Coverage) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Business insurance high deductible limits per occurrence	$ 1	$ 1	$ 1
Business insurance high deductible limits per occurrence in the next fiscal year	1
Self-insured medical benefits reserve	$ 12.9	$ 9.4

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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