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Fixed interest rate related to the interest rate derivative.

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Borrowings and Finance Lease Obligations (Details) - USD ($)			6 Months Ended		12 Months Ended
	Feb. 16, 2016	Jun. 23, 2015	Aug. 03, 2019	Aug. 04, 2018	Feb. 03, 2018	Mar. 31, 2019	Feb. 02, 2019
Debt Instrument [Line Items]
Mortgage debt, maturing monthly through January 2026			$ 19,384,000				$ 19,738,000
Finance lease obligations			18,083,000
Finance lease obligations							16,702,000
Borrowings under credit facilities			27,770,000				0
Other			2,829,000				2,887,000
Less current installments			32,554,000				4,315,000
Mortgage Debt
Mortgage debt, maturing monthly through January 2026			19,384,000				19,738,000
Debt issuance costs			4,032,000
Finance Lease
Finance lease obligations incurred			3,055,000	$ 1,164,000
Finance lease obligations			18,083,000
Capital lease obligations							16,702,000
Credit Facilities
Credit Facility, outstanding amount			$ 27,770,000				0
Interest rate swap \| Derivatives designated as hedging instruments \| Cash flow hedges
Mortgage Debt
Fixed rate of interest rate swap derivative (as a percent)			3.06%
Europe \| Foreign line of credit
Debt Instrument [Line Items]
Borrowings under credit facilities			$ 27,800,000
Credit Facilities
Current borrowing capacity			126,500,000
Letters of credit outstanding			0
Credit Facility, outstanding amount			$ 27,800,000
Europe \| Foreign line of credit \| Minimum
Credit Facilities
Interest rate (as a percent)			0.50%
Europe \| Foreign line of credit \| Maximum
Credit Facilities
Interest rate (as a percent)			4.60%
Mortgage debt \| Building \| U.S.
Debt Instrument [Line Items]
Mortgage debt, maturing monthly through January 2026	$ 21,500,000		$ 19,400,000				19,700,000
Mortgage Debt
Debt maturity period (in years)	10 years
Mortgage debt, maturing monthly through January 2026	$ 21,500,000		19,400,000				19,700,000
Debt amortization period (in years)	25 years
Debt issuance costs			$ 100,000				100,000
Mortgage debt \| Building \| U.S. \| LIBOR
Mortgage Debt
Interest rate margin (as a percent)			1.50%
Mortgage debt \| Building \| U.S. \| Interest rate swap
Mortgage Debt
Fair value of cash flow hedge liability			$ (100,000)
Fair value of cash flow hedge asset							1,000,000.0
Mortgage debt \| Building \| U.S. \| Interest rate swap \| Derivatives designated as hedging instruments \| Cash flow hedges
Mortgage Debt
Fixed rate of interest rate swap derivative (as a percent)	3.06%
Finance lease \| Equipment \| Netherlands
Debt Instrument [Line Items]
Finance lease obligations			13,600,000
Finance lease obligations							14,700,000
Finance Lease
Finance lease obligations incurred					$ 17,000,000.0
Effective interest rate on finance lease obligations					6.00%
Finance lease obligations			13,600,000
Capital lease obligations							14,700,000
Finance lease \| Computer hardware and software
Debt Instrument [Line Items]
Finance lease obligations			4,500,000
Finance lease obligations							2,000,000.0
Finance Lease
Finance lease obligations incurred			3,100,000
Finance lease obligations			4,500,000
Capital lease obligations							2,000,000.0
Credit Facility
Debt Instrument [Line Items]
Borrowings under credit facilities			0
Credit Facilities
Credit Facility, outstanding amount			$ 0
Percentage of borrowings exceeding borrowing base that require the Company to comply with a fixed charge coverage ratio on a trailing four-quarter basis			80.00%
Credit Facility \| Revolving Credit Facility
Mortgage Debt
Debt maturity period (in years)		5 years
Credit Facilities
Maximum borrowing capacity		$ 150,000,000
Current borrowing capacity			$ 134,000,000
Credit Facility \| Accordion feature
Credit Facilities
Maximum borrowing capacity		150,000,000
Credit Facility \| U.S. line of credit \| Base rate \| Minimum
Mortgage Debt
Interest rate margin (as a percent)			0.25%
Credit Facility \| U.S. line of credit \| Base rate \| Maximum
Mortgage Debt
Interest rate margin (as a percent)			0.75%
Credit Facility \| U.S. line of credit \| LIBOR
Credit Facilities
Interest rate margin added to respective base rate			1.00%
Credit Facility \| U.S. line of credit \| LIBOR \| Minimum
Mortgage Debt
Interest rate margin (as a percent)			1.25%
Credit Facility \| U.S. line of credit \| LIBOR \| Maximum
Mortgage Debt
Interest rate margin (as a percent)			1.75%
Credit Facility \| U.S. line of credit \| Federal funds rate
Credit Facilities
Interest rate margin added to respective base rate			0.50%
Credit Facility \| Standby letters of credit
Credit Facilities
Letters of credit outstanding			$ 2,300,000
Credit Facility \| Documentary letters of credit
Credit Facilities
Letters of credit outstanding			$ 0
Credit Facility \| Canada \| Foreign line of credit
Credit Facilities
Maximum borrowing capacity		$ 50,000,000
Credit Facility \| Canada \| Foreign line of credit \| Prime rate \| Minimum
Mortgage Debt
Interest rate margin (as a percent)			0.25%
Credit Facility \| Canada \| Foreign line of credit \| Prime rate \| Maximum
Mortgage Debt
Interest rate margin (as a percent)			0.75%
Credit Facility \| Canada \| Foreign line of credit \| Canadian BA rate
Credit Facilities
Interest rate margin added to respective base rate			1.00%
Credit Facility \| Canada \| Foreign line of credit \| Canadian BA rate \| Minimum
Mortgage Debt
Interest rate margin (as a percent)			1.25%
Credit Facility \| Canada \| Foreign line of credit \| Canadian BA rate \| Maximum
Mortgage Debt
Interest rate margin (as a percent)			1.75%
Credit Facility \| Canada \| Foreign line of credit \| Bank of Canada overnight rate
Credit Facilities
Interest rate margin added to respective base rate			0.50%
Long-term debt and finance lease liabilities, excluding convertible senior notes
Debt Instrument [Line Items]
Total debt and finance lease obligations			$ 68,066,000				39,327,000
Less current installments			32,554,000				4,315,000
Long-term debt and finance lease obligations, net			35,512,000				$ 35,012,000
Multicurrency Borrowing Agreement
Credit Facilities
Maximum borrowing capacity						$ 20,000,000.0
Letters of credit outstanding			0
Outstanding borrowings			$ 0