| Stock Repurchase Program (Details) (USD $) | 3 Months Ended | ||||
|---|---|---|---|---|---|
| Sep. 30, 2011 | Sep. 30, 2010 | Jun. 30, 2011 | Jul. 31, 1997 | Feb. 28, 2011
 February 2011 shares authorized | |
| Stock Repurchase Program | |||||
| Authorized shares to be repurchased | 72,800,000 | 10,000,000 | |||
| Unpaid cost of stock repurchases | $ 3,300,000 | $ 2,700,000 | |||
| Shares available for repurchase | 7,300,000 | ||||
| Number of shares of common stock repurchased | 1,763,000 | 1,972,000 | |||
| Total cost of repurchases | $ 66,982,000 | $ 59,323,000 | |||
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- Definition Authorized Shares To Be Repurchased 
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- Definition Shares Available For Repurchase 
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- Definition Unpaid Cost Of Stock Repurchases 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. 
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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