Stockholders' Equity (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Oct. 31, 2014	Jan. 31, 2014	Jan. 31, 2013
Stockholders' Equity
Number of shares of common stock issued	0.7
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of the period	$ (82,000)
Other comprehensive income (loss) before reclassifications	(420,000)
Amounts reclassified from accumulated other comprehensive loss	91,000
Other comprehensive income (loss)	(329,000)	270,000
Balance at end of the period	(411,000)
Repurchase of common stock (in shares)	0.2
Repurchase of common stock	10,100,000
Unrealized Gain on Cash Flow Hedge
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of the period	215,000
Other comprehensive income (loss) before reclassifications	(407,000)
Amounts reclassified from accumulated other comprehensive loss	85,000
Other comprehensive income (loss)	(322,000)
Balance at end of the period	(107,000)
Net Unrealized Losses on Available-For-Sale Securities
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of the period	(297,000)
Other comprehensive income (loss) before reclassifications	(13,000)
Amounts reclassified from accumulated other comprehensive loss	6,000
Other comprehensive income (loss)	(7,000)
Balance at end of the period	(304,000)
High end of range
Stockholders' Equity
Program Amount authorized to repurchase			$ 100,000,000	$ 100,000,000	$ 50,000,000