Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jul. 31, 2014
Current assets:
Cash and cash equivalents	$ 151,425	$ 183,515
Trading securities	74,835	22,793
Accounts receivable, trade, net of allowance for doubtful accounts of $54 and $63 at April 30, 2015 and July 31, 2014, respectively	121,689	123,948
Inventories	65,746	65,269
Prepaid expenses and other current assets	25,180	10,243
Total current assets	438,875	405,768
Property and equipment, net	23,764	25,126
Investments in affiliates	2,278	7,172
Goodwill	3,058	3,058
Other intangible assets, net		667
Other assets	7,600	9,855
Total assets	475,575	451,646
Current liabilities:
Accounts payable	162,001	105,045
Accrued restructuring	2,469	2,246
Accrued expenses	37,608	39,544
Other current liabilities	36,733	51,759
Total current liabilities	238,811	198,594
Long-term portion of accrued restructuring		39
Notes payable	76,696	73,391
Other long-term liabilities	8,022	8,004
Long-term liabilities	84,718	81,434
Total liabilities	323,529	280,028
Stockholders' equity:
Preferred stock, $0.01 par value per share. Authorized 5,000,000 shares; zero issued or outstanding shares at April 30, 2015 and July 31, 2014
Common stock, $0.01 par value per share. Authorized 1,400,000,000 shares; 52,190,790 issued and outstanding shares at April 30, 2015; 52,100,763 issued and outstanding shares at July 31, 2014	522	521
Additional paid-in capital	7,451,879	7,450,541
Accumulated deficit	(7,306,852)	(7,293,412)
Accumulated other comprehensive income	6,497	13,968
Total stockholders' equity	152,046	171,618
Total liabilities and stockholders' equity	$ 475,575	$ 451,646