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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Dec. 31, 2017	Nov. 08, 2016	Nov. 26, 2016	Aug. 26, 2017	Aug. 27, 2016	Aug. 29, 2015
Debt Instrument [Line Items]
Long-term debt, gross				$ 284,000	$ 0
Less: debt issuance cost, net				(9,424)	0
Long-term debt				274,576	0
Less: current maturities				(2,850)	0
Long-term debt, less current maturities				271,726	0
Debt Issuance Costs, Gross				9,400
Accumulated Amortization, Debt Issuance Costs				1,600
Debt Issuance Costs, Current, Net				1,400
Debt Issuance Costs, Noncurrent, Net				8,000
Amortization of Debt Issuance Costs				1,596	0	$ 0
Prior Credit Agreement [Member]
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs			$ 100
Line of Credit [Member] \| ABL
Debt Instrument [Line Items]
Long-term debt, gross				0	0
Line of Credit [Member] \| Term Loan
Debt Instrument [Line Items]
Long-term debt, gross				$ 284,000	$ 0
JPMorgan Chase [Member] \| Line of Credit [Member] \| ABL
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 125,000
Debt Instrument, Term		5 years
JPMorgan Chase [Member] \| Line of Credit [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 10,000
JPMorgan Chase [Member] \| Line of Credit [Member] \| Term Loan
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 300,000
Debt Instrument, Term		7 years
Debt Instrument, Periodic Payment, Principal, Percent of Original Amount		1.00%
Line of Credit Facility, Accordion Feature, Increase Limit		$ 125,000
Debt Instrument, Interest Rate, Effective Percentage				5.70%
Scenario, Forecast [Member] \| JPMorgan Chase [Member] \| Line of Credit [Member] \| Term Loan
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal, Percent of Original Amount	1.25%