Long-Term Debt And Credit Facility (Details) (USD $)	9 Months Ended
Mar. 31, 2012
Debt Disclosure [Abstract]
Aggregate principal amount of senior notes	$ 150,000,000
Senior notes term, in years	10
Senior notes maturity date	May 02, 2016
Senior notes interest percentage	5.98%
Senior notes outstanding	150,000,000
Revolving credit facility	400,000,000
Revolving credit facility expiration date	July 2015
Interest coverage ratio	4.00
Leverage ratio	3.50
Consolidated leverage ratio	4.0
Additional borrowing under credit agreement	100,000,000
Borrowings outstanding under credit agreement	$ 280,000,000

Consolidated leverage ratio to indebtedness

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Consolidated Leverage Ratio Upper Limit

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- Definition

Interest Coverage Ratio

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- Definition

Line Of Credit Potential Incremental Borrowing Capacity

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- Definition

Senior Notes Term

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

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Interest rate stated in the contractual debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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-Publisher FASB

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

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Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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