Long-term Debt and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		4 Months Ended	12 Months Ended
	Jan. 31, 2017	Apr. 20, 2019	Dec. 28, 2019	Feb. 28, 2019	Dec. 29, 2018	Dec. 03, 2013	Jan. 11, 2012	Apr. 26, 2010
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount			$ 747,320		$ 1,045,930
Long-term Debt, Current Maturities			0		(210)
Long-term Debt, Excluding Current Maturities			747,320		1,045,720
Fair value of long-term debt			795,000		1,074,000
Line of Credit Facility, Remaining Borrowing Capacity			$ 1,000,000
Debt Instrument, Redemption, Description			We may redeem some or all of the Notes at any time or from time to time, at the redemption price described in the Indenture. In addition, in the event of a Change of Control Triggering Event (as defined in the Indenture for the Notes), we will be required to offer to repurchase the Notes at a price equal to 101% of the principal amount thereof, plus accrued and unpaid interest to the repurchase date. The Notes are currently fully and unconditionally guaranteed, jointly and severally, on an unsubordinated and unsecured basis by each of the subsidiary guarantors. We will be permitted to release guarantees without the consent of holders of the Notes under the circumstances described in the Indenture: (i) upon the release of the guarantee of our other debt that resulted in the affected subsidiary becoming a guarantor of this debt; (ii) upon the sale or other disposition of all or substantially all of the stock or assets of the subsidiary guarantor; or (iii) upon our exercise of our legal or covenant defeasance option.
Guarantor Obligations, Maximum Exposure, Undiscounted			$ 26,400
Guarantor Obligations, Collateral Held			$ 50,300
Indenture provisions for events of default			The Indenture contains customary provisions for events of default including for: (i) failure to pay principal or interest when due and payable; (ii) failure to comply with covenants or agreements in the Indenture or the Notes and failure to cure or obtain a waiver of such default upon notice; (iii) a default under any debt for money borrowed by us or any of our subsidiaries that results in acceleration of the maturity of such debt, or failure to pay any such debt within any applicable grace period after final stated maturity, in an aggregate amount greater than $25.0 million without such debt having been discharged or acceleration having been rescinded or annulled within 10 days after receipt by us of notice of the default by the Trustee or holders of not less than 25% in aggregate principal amount of the Notes then outstanding; and (iv) events of bankruptcy, insolvency or reorganization affecting us and certain of its subsidiaries. In the case of an event of default, the principal amount of the Notes plus accrued and unpaid interest may be accelerated. The Indenture also contains covenants limiting the ability of us and our subsidiaries to incur debt secured by liens and to enter into sale and lease-back transactions.
Long-term Debt, Fiscal Year Maturity [Abstract]
2020			$ 0
2021			0
2022			300,000
2023			450,000
2024			0
Thereafter			0
Long-term Debt, Gross			750,000
5.75% senior unsecured notes (2020 Notes) [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 300,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net					802
Debt Instrument, Interest Rate, Stated Percentage								5.75%
Charges Relating to Debt Issuance Costs from 2020 Senior Unsecured Notes		$ 700
Debt Issuance, Percentage Of Principal								99.587%
Charges Relating to Make-Whole Provision of 2020 Senior Unsecured Notes Agreement		$ 10,100
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Repurchased Face Amount				$ 300,000
4.50% senior unsecured notes (2022 Notes) [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 300,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net			559		833
Debt Instrument, Interest Rate, Stated Percentage							4.50%
Debt Issuance, Percentage Of Principal							99.968%
4.50% senior unsecured notes (2023 Notes) [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 450,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net			2,121		2,645
Debt Instrument, Interest Rate, Stated Percentage						4.50%
Debt Issuance, Percentage Of Principal						99.69%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount			0
Line of Credit Facility, Maximum Borrowing Capacity			1,000,000
Line of credit facility increase increment limit			$ 250,000
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.10%
Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.10%
Revolving Credit Facility [Member] | letters of credit sublimit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 200,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			0
Senior Notes [Member] | 5.75% senior unsecured notes (2020 Notes) [Member]
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount			0		299,198
Senior Notes [Member] | 4.50% senior unsecured notes (2022 Notes) [Member]
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount			299,441		299,167
Senior Notes [Member] | 4.50% senior unsecured notes (2023 Notes) [Member]
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount			447,879		447,355
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount			0		210
Bilateral Letter of Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			$ 111,600		$ 100,500
2013 Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage			0.15%
Minimum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.91%
Minimum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.00%
Maximum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
Maximum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.50%