Annual report pursuant to Section 13 and 15(d)

Quarterly Consolidated Results of Operations (Unaudited) (Details)

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Quarterly Consolidated Results of Operations (Unaudited) (Details) - USD ($)
$ / shares in Units, $ 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
Debt Instrument [Line Items]                      
Total revenues $ 756,332 $ 738,459 $ 676,357 $ 642,901 $ 734,343 $ 831,599 $ 705,129 $ 658,337 $ 2,814,049 $ 2,929,408 $ 2,842,781
Gross margin 433,065 418,177 393,144 354,434 407,678 488,773 419,315 380,680      
Net income $ 142,019 $ 131,638 $ 20,268 $ 72,233 $ 128,731 $ 203,581 $ 139,246 $ 111,197 $ 366,158 $ 582,755 $ 543,149
Net income per share:                      
Basic (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 (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
Recapitalization costs     $ 2,500                
Senior Notes | Senior Notes Due May 1, 2018                      
Net income per share:                      
Gains (losses) on extinguishment of debt     $ 131,700                
[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.