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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]        
Basic earnings per share, Net income $ 53,500 $ 61,108 $ 84,130 $ 80,537
Basic earnings per share (in dollars per share) $ 0.90 $ 1.04 $ 1.42 $ 1.38
Diluted earnings per share, Net income $ 53,500 $ 61,108 $ 84,130 $ 80,537
Diluted earnings per share (in dollars per share) $ 0.90 $ 1.04 $ 1.41 $ 1.37
Weighted-average number of shares outstanding - Basic (in shares) 59,136 58,503 59,100 58,473
Effect of dilutive securities (in shares) 457 480 375 488
Weighted-average number of shares outstanding - Diluted (in shares) 59,593 58,983 59,475 58,961
Excluded as anti-dilutive (in shares) 113 1,076 235 1,065