Taxes on Earnings (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Income Tax Contingency [Line Items]
Realized tax benefits related to employee equity programs	$ 23,331	$ 42,382	$ 29,759
Valuation allowance for deferred tax asset	(3,730)	0
Reserves for unrecognized tax benefits	98,600	94,200	101,700
Interest related to the reserve for unrecognized tax benefits	17,500	18,800	$ 23,600
Impact of recognizing taxes and interest related to unrecognized tax benefits	49,100
Unrecognized tax benefits reduction resulting from lapse of applicable statute of limitations	$ 4,300
Internal Revenue Service [Member] | Earliest [Member]
Income Tax Contingency [Line Items]
Open tax year	2013
Internal Revenue Service [Member] | Latest [Member]
Income Tax Contingency [Line Items]
Open tax year	2016
State [Member]
Income Tax Contingency [Line Items]
Tax credit carryforward	$ 22,800	$ 16,100
State [Member] | Earliest [Member]
Income Tax Contingency [Line Items]
Open tax year	2012
State [Member] | Latest [Member]
Income Tax Contingency [Line Items]
Open tax year	2016