Long-Term and Short-Term Financing Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Aug. 01, 2015	Aug. 01, 2015	Jan. 31, 2015
Debt Instrument [Line Items]
Restricted Cash and Cash Equivalents	$ 41,482	$ 41,482
Gains (Losses) on Extinguishment of Debt	(8,690)	$ (8,690)
Line of Credit Facility, Expiration Date		Dec. 18, 2019
Line of Credit Facility, Maximum Borrowing Capacity	600,000	$ 600,000
Line Of Credit Borrowing Capacity Increase Option	150,000	$ 150,000
Line Of Credit Facility Percentage Of Borrowing Base Under Condition One		13.00%
Number of consecutive business days for borrowing base availability over minimum under condition one		30 days
Line Of Credit Facility Percentage Of Borrowing Base Under Condition Two		10.00%
Line Of Credit Facility Borrowing Base Availability Under Condition Two		$ 50,000
Line of Credit Facility, Maximum Month-end Outstanding Amount	6,300	6,300
Line of Credit Facility, Remaining Borrowing Capacity	593,700	593,700
Debt Instrument, Face Amount	$ 200,000	$ 200,000
Two Thousand Nineteen Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			7.125%