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Consolidated Statements Of Shareholders' Equity (USD $)
Comprehensive Income [Member]
Common Shares [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Balances at Jan. 31, 2009   $ 17,000 $ 170,166,000 $ 901,339,000 $ (17,747,000) $ 1,053,775,000
Balances, shares at Jan. 31, 2009   167,712,088        
Net income 219,893,000     219,893,000   219,893,000
Foreign currency translation 7,173,000       7,173,000 7,173,000
Unrealized gains (losses) on marketable securities, net of tax 1,480,000       1,480,000 1,480,000
Comprehensive income 228,546,000          
Share-based compensation     4,766,000     4,766,000
Stock options and awards     3,250,000     3,250,000
Stock options and awards, shares   846,283        
Tax effect of share exercises     6,438,000     6,438,000
Balances at Jan. 31, 2010   17,000 184,620,000 1,121,232,000 (9,094,000) 1,296,775,000
Balances, shares at Jan. 31, 2010   168,558,371        
Net income 272,958,000     272,958,000   272,958,000
Foreign currency translation (429,000)       (429,000) (429,000)
Unrealized gains (losses) on marketable securities, net of tax (739,000)       (739,000) (739,000)
Comprehensive income 271,790,000          
Share-based compensation     10,725,000     10,725,000
Stock options and awards     24,129,000     24,129,000
Stock options and awards, shares   2,256,273        
Tax effect of share exercises     12,847,000     12,847,000
Share Repurchases     (204,718,000)     (204,718,000)
Share Repurchases, shares   (6,401,217)        
Balances at Jan. 31, 2011   17,000 27,603,000 1,394,190,000 (10,262,000) 1,411,548,000
Balances, shares at Jan. 31, 2011   164,413,427        
Net income 185,251,000     185,251,000   185,251,000
Foreign currency translation (2,285,000)       (2,285,000) (2,285,000)
Unrealized gains (losses) on marketable securities, net of tax 1,035,000       1,035,000 1,035,000
Comprehensive income 184,001,000          
Share-based compensation     3,068,000     3,068,000
Stock options and awards     4,134,000     4,134,000
Stock options and awards, shares   993,923        
Tax effect of share exercises     8,995,000     8,995,000
Share Repurchases   (20,774,343) (43,800,000) (501,676,000)   (545,478,000)
Share Repurchases, shares   (2,000)        
Balances at Jan. 31, 2012   $ 15,000   $ 1,077,765,000 $ (11,512,000) $ 1,066,268,000
Balances, shares at Jan. 31, 2012   144,633,007