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Accounts and Notes Receivable - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			6 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ 5.2	$ 5.1
Notes receivable, total	9.7
Note receivable, current	$ 6.2
Notes receivable interest rate over prime rate	1.50%
Notes receivable, maturity year			2014	2017

An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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