Long-Term and Short-Term Financing Arrangements (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended
	Aug. 26, 2015	Jul. 24, 2015	Dec. 18, 2014	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014	Jul. 27, 2015	May. 11, 2011
Debt Instrument [Line Items]
Loss on early extinguishment of debt				$ 1,961	$ 0	$ 10,651	$ 0
Line of Credit Facility, Expiration Date			Dec. 18, 2019
Line of Credit Facility, Maximum Borrowing Capacity			$ 600,000
Line Of Credit Borrowing Capacity Increase Option			$ 150,000
Line Of Credit Facility Percentage Of Borrowing Base Under Condition One			12.50%
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				561,800		561,800
Two Thousand Nineteen Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	103.563%	103.95%
Principal Amount Redeemed in Tender Offer	$ 39,300	$ 160,700
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		80.35%
Loss on early extinguishment of debt				$ 1,961		$ 10,651
Debt Instrument, Interest Rate, Stated Percentage									7.125%
Debt Instrument, Face Amount									$ 200,000
Two Thousand Twenty Three Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						101.00%
Debt Instrument, Interest Rate, Stated Percentage								6.25%
Debt Instrument, Face Amount								$ 200,000
Proceeds from Issuance of Debt						$ 196,300
Two Thousand Twenty Three Senior Notes [Member] | Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						104.688%
Two Thousand Twenty Three Senior Notes [Member] | Debt Instrument, Redemption, Period Seven [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						100.00%
Two Thousand Twenty Three Senior Notes [Member] | Debt Instrument, Redemption, Period Five [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						103.125%
Two Thousand Twenty Three Senior Notes [Member] | Debt Instrument, Redemption, Period Six [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						101.563%