Credit Facilities (Narrative) (Details) (USD $)	12 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Margin rate on credit	1.50%
Outstanding uncommitted lines of credit	$ 62,905,000	$ 105,318,000
Weighted average interest rates on short-term borrowings outstanding	3.50%	3.80%
Uncommitted lines of credit [Member]
Debt Instrument [Line Items]
Outstanding uncommitted lines of credit	63,000,000	105,000,000
Unused lines of Credit [Member]
Debt Instrument [Line Items]
Outstanding uncommitted lines of credit	342,000,000
Bank Credit Agreement [Member]
Debt Instrument [Line Items]
Number Of Years Of Bank Credit Agreement	5 years
Maturity date of credit facility	Nov. 01, 2016
Bank Credit Agreement [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Margin rate on credit	0.50%
Bank Credit Agreement [Member] \| Prime Rate Or One Month Libor [Member]
Debt Instrument [Line Items]
Margin rate on credit	1.00%
Bank Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount under revolving credit facility	450,000,000
Bank Credit Agreement [Member] \| Amortizing Bank Term Loan Maturing November 2016 [Member]
Debt Instrument [Line Items]
Fully funded amortizing term loan	100,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount Outstanding under revolving credit facility	$ 0

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

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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+ Details

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- Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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-Name Regulation S-X (SX)

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-Subparagraph 2, 3

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- Definition

Weighted average interest rate of short-term debt outstanding.

+ References

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