Stockholders' Equity Stockholders' Equity (2017 Equity Incentive Plan) (Details) - shares		12 Months Ended
	May 17, 2017	Jan. 31, 2009	Feb. 03, 2018
2017 Equity Incentive Plan
Class of Stock [Line Items]
Initial share reserve (in shares)	12,000,000
Shares available for new restricted stock awards (in shares)			11,900,000
Options outstanding (in shares)			0
Options exercisable (in shares)			0
2008 and 2017 Equity Plan
Class of Stock [Line Items]
Share increase for equity plan (in shares)		5,500,000