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Consolidated Statements of Operations and Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]      
Revenues $ 865,268 $ 666,395 $ 595,947
Cost of revenues 469,560 341,600 333,760
Gross profit 395,708 324,795 262,187
Operating expenses:      
Research and development 69,094 57,765 54,565
Sales, general and administrative 36,853 33,269 21,607
Business e-mail compromise (BEC) fraud (recovery)/ loss 0 (8,294) 39,137
Total operating expenses 105,947 82,740 115,309
Income from operations 289,761 242,055 146,878
Interest expense and other, net (4,737) (2,115) (1,130)
Income before provision for income taxes 285,024 239,940 145,748
Provision for income taxes 27,518 26,324 16,085
Net income and comprehensive income $ 257,506 $ 213,616 $ 129,663
Net income per share of common stock:      
Basic (in dollars per share) $ 3.16 $ 2.53 $ 1.47
Diluted (in dollars per share) $ 3.09 $ 2.49 $ 1.45
Weighted average shares used in computing net income per share of common stock:      
Basic (in shares) 81,478 84,402 88,008
Diluted (in shares) 83,252 85,784 89,569
Cash dividends declared per common share (in dollars per share) $ 0 $ 0 $ 0.17