Annual report pursuant to Section 13 and 15(d)

Net Income Per Share (Details)

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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]                      
Net income $ 142,019 $ 131,638 $ 20,268 $ 72,233 $ 128,731 $ 203,581 $ 139,246 $ 111,197 $ 366,158 $ 582,755 $ 543,149
Denominator:                      
Weighted-average shares-basic, excluding unvested restricted stock units (in shares)                 162,282 166,016 166,089
Effect of dilutive options and restricted stock units (in shares)                 1,419 2,102 3,171
Weighted-average shares-diluted (in shares)                 163,701 168,118 169,260
Basic net income per share (in dollars per share) $ 0.90 [1] $ 0.81 [1] $ 0.12 [1] $ 0.44 [1] $ 0.78 [1] $ 1.22 [1] $ 0.84 [1] $ 0.67 [1] $ 2.26 $ 3.51 $ 3.27
Diluted net income per share (in dollars per share) $ 0.89 [1] $ 0.81 [1] $ 0.12 [1] $ 0.43 [1] $ 0.77 [1] $ 1.21 [1] $ 0.83 [1] $ 0.66 [1] $ 2.24 $ 3.47 $ 3.21
Anti-dilutive securities excluded from the computation of diluted net income per share (in shares)                 36 0 1,366
[1] Basic and diluted earnings per share are computed independently for each of the quarters presented based on the weighted-average basic and fully diluted shares outstanding for each quarter. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.