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Condensed Consolidated Balance Sheets (USD $)
In Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2011
Apr. 30, 2010
Jan. 31, 2011
Current assets:      
Cash and cash equivalents $ 243,939 $ 259,348 $ 340,257
Marketable securities 68,688 323,910 116,420
Accounts receivable, net of allowance for doubtful accounts of $1,078, $1,220 and $1,015, respectively 46,539 35,448 36,502
Inventories 264,278 221,984 229,561
Prepaid expenses, deferred taxes and other current assets 77,846 79,840 81,237
Total current assets 701,290 920,530 803,977
Property and equipment, net 601,249 548,575 586,346
Marketable securities 333,946 189,467 351,988
Deferred income taxes and other assets 57,774 49,606 52,010
Total Assets 1,694,259 1,708,178 1,794,321
Current liabilities:      
Accounts payable 109,444 100,439 82,904
Accrued expenses, accrued compensation and other current liabilities 102,562 96,738 128,120
Total current liabilities 212,006 197,177 211,024
Deferred rent and other liabilities 169,773 150,855 171,749
Total Liabilities 381,779 348,032 382,773
Commitments and contingencies (see Note 10)      
Shareholders' equity:      
Preferred shares; $.0001 par value, 10,000,000 shares authorized, none issued      
Common shares; $.0001 par value, 200,000,000 shares authorized, 159,667,925, 169,376,345 and 164,413,427 shares issued and outstanding, respectively 16 17 17
Additional paid-in-capital   198,702 27,603
Retained earnings 1,317,036 1,174,189 1,394,190
Accumulated other comprehensive loss (4,572) (12,762) (10,262)
Total Shareholders' Equity 1,312,480 1,360,146 1,411,548
Total Liabilities and Shareholders' Equity $ 1,694,259 $ 1,708,178 $ 1,794,321