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Fair Value Measurements (Details 2) - USD ($)
3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2015
Oct. 29, 2016
Jul. 30, 2016
Jan. 30, 2016
Aug. 01, 2015
Jan. 31, 2015
Marketable Securities              
Accumulated unrealized gains (losses), net of taxes, included in accumulated other comprehensive income (loss) related to available-for-sale securities $ (142,239,000) $ (142,239,000) $ (146,983,000) $ (137,214,000) $ (158,054,000) $ (142,804,000) $ (127,065,000)
Marketable Securities              
Marketable Securities              
Accumulated unrealized gains (losses), net of taxes, included in accumulated other comprehensive income (loss) related to available-for-sale securities (12,000) (12,000) $ 0 $ (16,000) $ (15,000) $ (11,000) $ (3,000)
Other income/expense              
Marketable Securities              
Other-than-temporary-impairment $ 0 $ 0