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Borrowings and Finance Lease Obligations (Details) - USD ($)		9 Months Ended
	Feb. 16, 2016	Oct. 31, 2020	May 02, 2020	Feb. 01, 2020
Debt Instrument [Line Items]
Term loans		$ 51,852,000		$ 0
Finance lease obligations		22,162,000		16,535,000
Mortgage debt		18,664,000		19,132,000
Borrowings under credit facilities		9,175,000		3,957,000
Other		2,295,000		2,636,000
Less current installments		34,079,000		9,490,000
Term Loans and Mortgage Debt
Mortgage debt		18,664,000		19,132,000
Finance Lease
Finance lease obligations		22,162,000		16,535,000
Credit Facilities
Credit Facility, outstanding amount		$ 9,175,000		3,957,000
Interest rate swap \| Derivatives designated as hedging instruments \| Cash flow hedges
Term Loans and 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		$ 0
Credit Facilities
Letters of credit outstanding		0
Credit Facility, outstanding amount		0
Remaining borrowing capacity		$ 142,300,000
Europe \| Foreign line of credit \| Minimum
Credit Facilities
Interest rate (as a percent)		0.70%
Europe \| Foreign line of credit \| Maximum
Credit Facilities
Interest rate (as a percent)		1.30%
China \| Foreign line of credit
Debt Instrument [Line Items]
Borrowings under credit facilities		$ 9,100,000		4,000,000.0
Credit Facilities
Maximum borrowing capacity		30,000,000.0	$ 20,000,000.0
Credit Facility, outstanding amount		9,100,000		4,000,000.0
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
Credit Facilities
Maximum borrowing capacity		$ 120,000,000
Current borrowing capacity		97,000,000
Credit Facility \| Accordion feature
Credit Facilities
Maximum borrowing capacity		$ 180,000,000
Credit Facility \| U.S. line of credit \| Base rate \| Minimum
Term Loans and Mortgage Debt
Interest rate margin (as a percent)		0.75%
Credit Facility \| U.S. line of credit \| Base rate \| Maximum
Term Loans and Mortgage Debt
Interest rate margin (as a percent)		1.25%
Credit Facility \| U.S. line of credit \| LIBOR
Credit Facilities
Interest rate margin added to respective base rate		1.00%
Minimum rate		1.00%
Credit Facility \| U.S. line of credit \| LIBOR \| Minimum
Term Loans and Mortgage Debt
Interest rate margin (as a percent)		1.75%
Credit Facility \| U.S. line of credit \| LIBOR \| Maximum
Term Loans and Mortgage Debt
Interest rate margin (as a percent)		2.25%
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		$ 2,100,000
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		$ 20,000,000
Credit Facility \| Canada \| Foreign line of credit \| Prime rate
Credit Facilities
Minimum rate		0.00%
Credit Facility \| Canada \| Foreign line of credit \| Prime rate \| Minimum
Term Loans and Mortgage Debt
Interest rate margin (as a percent)		0.75%
Credit Facility \| Canada \| Foreign line of credit \| Prime rate \| Maximum
Term Loans and Mortgage Debt
Interest rate margin (as a percent)		1.25%
Credit Facility \| Canada \| Foreign line of credit \| Canadian BA rate
Credit Facilities
Interest rate margin added to respective base rate		1.00%
Minimum rate		1.00%
Credit Facility \| Canada \| Foreign line of credit \| Canadian BA rate \| Minimum
Term Loans and Mortgage Debt
Interest rate margin (as a percent)		1.75%
Credit Facility \| Canada \| Foreign line of credit \| Canadian BA rate \| Maximum
Term Loans and Mortgage Debt
Interest rate margin (as a percent)		2.25%
Term Loans \| Europe
Debt Instrument [Line Items]
Term loans		$ 51,900,000
Term Loans \| Europe \| Minimum
Term Loans and Mortgage Debt
Debt maturity period (in years)		1 year
Credit Facilities
Interest rate (as a percent)		0.50%
Term Loans \| Europe \| Maximum
Term Loans and Mortgage Debt
Debt maturity period (in years)		5 years
Option to extend term (in years)		5 years
Credit Facilities
Interest rate (as a percent)		1.50%
Mortgage debt \| Building \| U.S.
Debt Instrument [Line Items]
Mortgage debt	$ 21,500,000	$ 18,700,000		19,100,000
Term Loans and Mortgage Debt
Debt maturity period (in years)	10 years
Mortgage debt	$ 21,500,000	18,700,000		19,100,000
Debt amortization period (in years)	25 years
Debt issuance costs		$ 100,000		100,000
Mortgage debt \| Building \| U.S. \| LIBOR
Term Loans and Mortgage Debt
Interest rate margin (as a percent)		1.50%
Mortgage debt \| Building \| U.S. \| Interest rate swap
Term Loans and Mortgage Debt
Fair value of cash flow hedge liability		$ 1,100,000		300,000
Mortgage debt \| Building \| U.S. \| Interest rate swap \| Derivatives designated as hedging instruments \| Cash flow hedges
Term Loans and Mortgage Debt
Fixed rate of interest rate swap derivative (as a percent)	3.06%
Finance lease \| Equipment \| Europe
Debt Instrument [Line Items]
Finance lease obligations		18,300,000		12,600,000
Finance Lease
Finance lease obligations		$ 18,300,000		12,600,000
Finance lease \| Equipment \| Netherlands
Finance Lease
Effective interest rate on finance lease obligations		6.00%
Finance lease \| Computer hardware and software
Debt Instrument [Line Items]
Finance lease obligations		$ 3,900,000		4,000,000.0
Finance Lease
Finance lease obligations		3,900,000		4,000,000.0
Long-term debt and finance lease liabilities, excluding convertible senior notes
Debt Instrument [Line Items]
Total debt and finance lease obligations		104,148,000		42,260,000
Less current installments		34,079,000		9,490,000
Long-term debt and finance lease obligations		$ 70,069,000		$ 32,770,000