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Borrowings and Capital Lease Obligations (Details)
6 Months Ended 12 Months Ended
Feb. 16, 2016
USD ($)
Jun. 23, 2015
USD ($)
Aug. 04, 2018
USD ($)
facility
Jul. 29, 2017
USD ($)
Feb. 03, 2018
USD ($)
Borrowings and capital lease obligations          
Mortgage debt, maturing monthly through January 2026     $ 19,982,000   $ 20,323,000
Capital lease obligations     17,671,000   18,589,000
Other     2,796,000   3,129,000
Total debt and capital lease obligations     40,449,000   42,041,000
Less current installments     3,504,000   2,845,000
Long-term debt and capital lease obligations     36,945,000   39,196,000
Mortgage Debt          
Mortgage debt, maturing monthly through January 2026     19,982,000   20,323,000
Capital Lease          
Capital lease obligations incurred     1,164,000 $ 17,522,000  
Capital lease obligations     $ 17,671,000   18,589,000
Interest rate swap | Derivatives designated as hedging instruments | Cash flow hedges          
Borrowings and capital lease obligations          
Fixed rate of interest rate swap derivative (as a percent)     3.06%    
Europe | Foreign line of credit          
Credit Facilities          
Current borrowing capacity     $ 83,700,000    
Credit Facility, outstanding amount     $ 0    
Number of credit facilities subject to minimum net equity requirement | facility     1    
Maximum borrowing capacity of the credit facility which is subject to a minimum net equity requirement     $ 40,500,000    
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%    
Europe | Documentary letters of credit | Foreign line of credit          
Credit Facilities          
Letters of credit outstanding     $ 0    
Mortgage debt | Building | U.S.          
Borrowings and capital lease obligations          
Mortgage debt, maturing monthly through January 2026 $ 21,500,000.0   19,982,000   20,323,000
Mortgage Debt          
Debt maturity period (in years) 10 years        
Mortgage debt, maturing monthly through January 2026 $ 21,500,000.0   19,982,000   20,323,000
Debt amortization period (in years) 25 years        
Debt issuance costs     $ 100,000   100,000
Mortgage debt | Building | U.S. | LIBOR          
Borrowings and capital lease obligations          
Interest rate margin (as a percent)     1.50%    
Mortgage debt | Building | U.S. | Interest rate swap          
Mortgage Debt          
Fair value of cash flow hedge interest rate swap asset     $ 1,525,000   1,460,000
Mortgage debt | Building | U.S. | Interest rate swap | Derivatives designated as hedging instruments | Cash flow hedges          
Borrowings and capital lease obligations          
Fixed rate of interest rate swap derivative (as a percent) 3.06%   3.06%    
Capital lease | Equipment | Netherlands          
Borrowings and capital lease obligations          
Capital lease obligations     $ 15,400,000   17,300,000
Capital Lease          
Capital lease obligations incurred         $ 17,000,000
Effective interest rate on capital lease obligations     6.00%   6.00%
Capital lease obligations     $ 15,400,000   $ 17,300,000
Capital lease | Computer hardware and software          
Borrowings and capital lease obligations          
Capital lease obligations     2,300,000   1,300,000
Capital Lease          
Capital lease obligations     2,300,000   $ 1,300,000
Credit Facility          
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 $ 150,000,000    
Current borrowing capacity     104,000,000    
Credit Facility | Accordion feature          
Credit Facilities          
Maximum borrowing capacity   150,000,000 $ 150,000,000    
Credit Facility | U.S. line of credit | Base rate | Minimum          
Borrowings and capital lease obligations          
Interest rate margin (as a percent)     0.25%    
Credit Facility | U.S. line of credit | Base rate | Maximum          
Borrowings and capital lease obligations          
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          
Borrowings and capital lease obligations          
Interest rate margin (as a percent)     1.25%    
Credit Facility | U.S. line of credit | LIBOR | Maximum          
Borrowings and capital lease obligations          
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     $ 1,600,000    
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 $ 50,000,000    
Credit Facility | Canada | Foreign line of credit | Prime rate | Minimum          
Borrowings and capital lease obligations          
Interest rate margin (as a percent)     0.25%    
Credit Facility | Canada | Foreign line of credit | Prime rate | Maximum          
Borrowings and capital lease obligations          
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          
Borrowings and capital lease obligations          
Interest rate margin (as a percent)     1.25%    
Credit Facility | Canada | Foreign line of credit | Canadian BA rate | Maximum          
Borrowings and capital lease obligations          
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%