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Long-Term Obligations (Narrative) (Details) (USD $)	12 Months Ended				0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended				12 Months Ended
	Mar. 31, 2014	Oct. 28, 2013	Mar. 31, 2013	Nov. 30, 2011	Oct. 15, 2013 Medium-term Notes [Member]	Mar. 31, 2014 Medium-term Notes [Member]	Oct. 28, 2013 Unsecured Debt [Member]	Mar. 31, 2014 Senior term note due 2018 [Member]	Mar. 31, 2014 Interest Rate Swap Agreements [Member]	Mar. 31, 2014 Interest Rate Swap [Member] Derivatives Designated As Hedges [Member]	Mar. 31, 2013 Interest Rate Swap [Member] Derivatives Designated As Hedges [Member]	Mar. 31, 2014 Bank Credit Agreement [Member]	Mar. 31, 2014 Bank Credit Agreement [Member] Long-term Debt [Member]	Mar. 31, 2013 Bank Credit Agreement [Member] Long-term Debt [Member]
Debt Instrument [Line Items]
Repayments of Debt					$ 200,000,000
Proceeds from Issuance of Senior Long-term Debt							175,000,000
Debt Instrument, Maturity Date						Dec. 01, 2014		Oct. 01, 2018				Nov. 01, 2016
Debt Instrument, Unused Borrowing Capacity, Amount		75,000,000
Debt Instrument, Basis Spread on Variable Rate	1.50%
Loans Payable to Bank				100,000,000
Debt Instrument, Interest Rate at Period End								1.69%						2.91%
Debt Instrument, Face Amount													100,000,000
Medium-term notes interest rate, percentage					5.20%	6.25%
Derivative, Notional Amount										81,300,000	92,500,000
Long-term debt	240,000,000		181,250,000
Derivative liability value									900,000
Long-term debt maturities, 2015	116,300,000
Long-term debt maturities, 2016	27,500,000
Long-term debt maturities, 2017	37,500,000
Long-term debt maturities, 2018	0
Long-term debt maturities, 2019	$ 175,000,000

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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The effective interest rate at the end of the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

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