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Condensed Consolidated Statements of Operations and Comperhensive Income (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
Revenues $ 138,439 $ 74,901 $ 268,126 $ 136,436
Cost of revenues 77,468 44,416 149,132 80,931
Gross profit 60,971 30,485 118,994 55,505
Operating expenses:        
Research and development 8,077 5,052 14,394 9,763
Sales, general and administrative 5,774 5,314 11,584 9,848
Total operating expenses 13,851 10,366 25,978 19,611
Income from operations 47,120 20,119 93,016 35,894
Interest expense and other, net (249) (197) (495) (283)
Income before provision for income taxes 46,871 19,922 92,521 35,611
Provision for income taxes 5,079 2,119 10,201 4,629
Net income and comprehensive income $ 41,792 $ 17,803 $ 82,320 $ 30,982
Net income per share of common stock:        
Basic (in usd per share) $ 0.48 $ 0.20 $ 0.94 $ 0.35
Diluted (in usd per share) $ 0.47 $ 0.20 $ 0.92 $ 0.34
Weighted average shares used in computing net income per share of common stock:        
Basic (in shares) 87,661 88,094 87,536 89,532
Diluted (in shares) 89,653 90,056 89,593 91,493
Cash dividends declared per common share $ 0 $ 0.18 $ 0 $ 0.18