Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Jun. 30, 2011
Current assets :
Cash and cash equivalents	$ 324,118	$ 247,153
Accounts receivable, net of allowances of $503 at March 31, 2012 and $709 at June 30, 2011	95,493	93,808
Inventories	27,975	28,850
Prepaid expenses and other current assets	4,476	4,373
Total current assets	452,062	374,184
Property and equipment at cost, net of accumulated depreciation of $35,785 and $29,443 at March 31, 2012 and June 30, 2011, respectively	24,800	26,222
Goodwill	1,927	1,927
Non-current investments	18,088	25,876
Other assets	26,333	27,992
Total assets	523,210	456,201
Current liabilities:
Accounts payable	47,062	44,930
Accrued compensation	11,469	13,210
Income taxes payable	8,788	11,808
Other accrued liabilities	27,598	22,813
Total current liabilities	94,917	92,761
Notes payable	2,305	2,305
Other liabilities	23,600	21,142
Stockholders' equity:
Common Stock: $0.001 par value;120,000,000 shares authorized, 48,432,280 and 46,832,208 shares issued, and 33,674,481 and 33,465,732 shares outstanding, at March 31, 2012 and June 30, 2011, respectively	48	47
Additional paid-in capital	460,714	406,653
Treasury stock: 14,757,799 and 13,366,476 common treasury shares at March 31, 2012 and June 30, 2011, respectively, at cost	(385,666)	(352,142)
Accumulated other comprehensive income	2,533	2,520
Retained earnings	324,759	282,915
Total stockholders' equity	402,388	339,993
Liabilities and stockholders' equity	$ 523,210	$ 456,201