Debt - Additional Information (Details)			6 Months Ended
	May 24, 2018 USD ($)	Oct. 30, 2014 USD ($)	Aug. 04, 2018 USD ($) Note	Feb. 03, 2018 USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ 271,000	$ 190,000
Wrote off of unamortized debt issuance costs			186,000
Credit Facility
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 140,000,000		46,800,000
Line of credit facility, maximum borrowing capacity	125,000,000
Line of credit facility, potential maximum borrowing capacity	$ 50,000,000
Debt instrument interest rate	10.00%
Line of credit facility	$ 7,500,000
Unamortized debt issuance costs			400,000
Line of credit facility, remaining borrowing capacity			41,300,000
Line of credit facility, average monthly outstanding amount			57,100,000
Line of credit facility, average unused excess availability			$ 33,300,000
Unused line fee			0.25%
Wrote off of unamortized debt issuance costs			$ 100,000
Credit Facility | LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, amount outstanding			$ 42,000,000
Line of credit facility interest rate			3.25%
Line of credit facility, expiration date			Aug. 08, 2018
Credit Facility | Prime-based Borrowings
Debt Instrument [Line Items]
Line of credit facility interest rate			5.25%
Credit Facility | Minimum
Debt Instrument [Line Items]
Debt instrument consolidated fixed coverage ratio	100.00%
Credit Facility | Minimum | Federal Funds Rate
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate	0.25%
Credit Facility | Minimum | LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate	1.25%
Credit Facility | Maximum | Federal Funds Rate
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate	0.50%
Credit Facility | Maximum | LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate	1.50%
Credit Facility | Commercial And Standby Letters Of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 20,000,000
Credit Facility | Swingline Loans
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	15,000,000
Credit Facility | Standby Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount			$ 2,800,000
Credit Facility | Documentary Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount			500,000
FIFO Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000
FIFO Facility | LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, amount outstanding			$ 15,000,000
Line of credit facility interest rate			4.87%
Line of credit facility, expiration date			Aug. 06, 2018
Debt Instrument, Description of Variable Rate Basis			2-month LIBOR
FIFO Facility | Minimum | Federal Funds Rate
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate			1.75%
FIFO Facility | Minimum | LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate			2.75%
FIFO Facility | Maximum | Federal Funds Rate
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate			2.00%
FIFO Facility | Maximum | LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate			3.00%
Master Agreement
Debt Instrument [Line Items]
Number of notes entered, equipment financing | Note			12
Notes maturity term			48 months
Master Agreement | Banc of America Leasing & Capital, LLC
Debt Instrument [Line Items]
Aggregate amount of notes borrowed			$ 26,400,000
Master Agreement | Minimum
Debt Instrument [Line Items]
Notes fixed interest rate			3.07%
Master Agreement | Maximum
Debt Instrument [Line Items]
Notes fixed interest rate			3.50%
Term Loan Facility
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ 100,000
Line of credit facility, Initiation date			Oct. 30, 2014
Term Loan Facility | Term loan, due 2019
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate		6.50%
Debt Instrument, Description of Variable Rate Basis			one month LIBOR rate
Notes fixed interest rate		1.00%
Secured term loan facility, face amount		$ 15,000,000
Secured term loan facility, effective date			Oct. 29, 2014
Debt Instrument, Interest Rate Terms			Interest on the Term Loan Facility was at a rate per annum equal to the greater of (a) 1.00% and (b) the one month LIBOR rate, plus 6.50%.