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, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 938,647 $ 913,809 $ 876,885 $ 750,673 $ 919,171 $ 712,433 $ 710,245 $ 642,644 $ 3,480,014 $ 2,984,493 $ 2,814,049
Gross margin 590,717 570,535 558,378 472,837 581,603 437,834 429,265 372,400      
Net income $ 256,162 $ 253,562 $ 238,251 $ 178,101 $ 271,541 $ 175,777 $ 152,207 $ 104,897 $ 926,076 $ 704,422 $ 366,158
Net income per share:                      
Basic (in dollars per share) $ 1.64 [1] $ 1.62 [1] $ 1.52 [1] $ 1.14 [1] $ 1.74 [1] $ 1.13 [1] $ 0.98 [1] $ 0.67 [1] $ 5.92 $ 4.52 $ 2.26
Diluted (in dollars per share) $ 1.62 [1] $ 1.61 [1] $ 1.52 [1] $ 1.13 [1] $ 1.73 [1] $ 1.12 [1] $ 0.98 [1] $ 0.66 [1] $ 5.88 $ 4.49 $ 2.24
[1] Basic and diluted net income 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 net income per share information may not equal annual basic and diluted net income per share.