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Defined Benefit Plans (Details)
$ in Thousands, SFr in Millions
 3 Months Ended 9 Months Ended
Oct. 31, 2015
USD ($)
participant
Oct. 31, 2015
CHF (SFr)
Aug. 01, 2015
USD ($)
May. 02, 2015
USD ($)
Nov. 01, 2014
USD ($)
Oct. 31, 2015
USD ($)
participant
Oct. 31, 2015
CHF (SFr)
Nov. 01, 2014
USD ($)
Oct. 31, 2015
CHF (SFr)
participant
Jan. 31, 2015
USD ($)
Jan. 31, 2015
CHF (SFr)
Components of net periodic defined benefit pension cost                      
Actuarial gain $ 0       $ 0 $ 11,378   $ 0      
SERP                      
Components of net periodic defined benefit pension cost                      
Interest cost 498       573 1,489   1,717      
Net amortization of unrecognized prior service credit 0       (58) (97)   (174)      
Net amortization of actuarial losses 11       234 729   703      
Curtailment gain 0   $ (1,651)   0 (1,651)   0      
Net periodic defined benefit pension cost $ 509       749 $ 470   2,246      
Number of employees considered actively participating under the terms of the SERP | participant 0         0     0    
Actuarial gain     $ 11,378     $ 11,378          
SERP benefit payments $ 400       600 1,300   800      
Swiss Pension Plan                      
Components of net periodic defined benefit pension cost                      
Net periodic defined benefit pension cost 400 SFr 0.4       1,300 SFr 1.3        
Projected benefit obligation 15,000         15,000     SFr 14.8 $ 15,100 SFr 13.9
Plan assets held at the independent fiduciary 12,600         12,600     12.4 12,500 11.5
Other income/expense | SERP                      
Components of net periodic defined benefit pension cost                      
Gain (loss) as a result of changes in value of the insurance policy investments, included in other income and expense (800)       $ 800 800   $ 3,000      
Realized gain resulting from payout on insurance policy investments       $ 700   700          
Other assets | SERP                      
Components of net periodic defined benefit pension cost                      
Cash surrender values of the insurance policies held in a rabbi trust 55,100         55,100       53,600  
Accrued expenses and other long-term liabilities | SERP                      
Components of net periodic defined benefit pension cost                      
Projected benefit obligation 50,700         50,700       61,900  
Other long-term liabilities | Swiss Pension Plan                      
Components of net periodic defined benefit pension cost                      
Net liability $ 2,400         $ 2,400     SFr 2.4 $ 2,600 SFr 2.4