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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 |  |
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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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