Investments and Restricted Investments - Balance Sheet Items (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 1,111,599	$ 761,602
Restricted cash and cash equivalents	64,581	67,947
Restricted investments	0	3,736
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,288	3,068
Restricted investments	$ 3,628	$ 0