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Consolidated Statement of Shareholders' Equity - 9 months ended Oct. 31, 2015 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Balance (in shares) at Jan. 31, 2015 684,733,200 684,733,000      
Balance at Jan. 31, 2015 $ 4,264,230 $ 684,733   $ (554,385) $ 4,133,882
Net income 1,611,192       1,611,192
Other comprehensive income (loss), net of tax 9,210     9,210  
Cash dividends declared on common stock (425,141)       (425,141)
Recognition of share-based compensation 71,063   $ 71,063    
Issuance of common stock under Stock Incentive Plan and related tax effect (in shares)   3,700,000      
Issuance of common stock under Stock Incentive Plan and related tax effect 116,011 $ 3,700 112,311    
Common stock repurchased (in shares)   (18,904,000)      
Common stock repurchased $ (1,296,104) $ (18,904) $ (183,374)   (1,093,826)
Balance (in shares) at Oct. 31, 2015 669,529,129 669,529,000      
Balance at Oct. 31, 2015 $ 4,350,461 $ 669,529   $ (545,175) $ 4,226,107