Defined Benefit Plans (Details)	3 Months Ended						3 Months Ended
	May 02, 2015 SERP USD ($)	May 03, 2014 SERP USD ($)	May 02, 2015 Swiss Pension Plan USD ($)	May 02, 2015 Swiss Pension Plan CHF	Jan. 31, 2015 Swiss Pension Plan USD ($)	Jan. 31, 2015 Swiss Pension Plan CHF	May 02, 2015 Other income/expense SERP USD ($)	May 03, 2014 Other income/expense SERP USD ($)	May 02, 2015 Other assets SERP USD ($)	Jan. 31, 2015 Other assets SERP USD ($)	May 02, 2015 Accrued expenses and other long-term liabilities SERP USD ($)	Jan. 31, 2015 Accrued expenses and other long-term liabilities SERP USD ($)	May 02, 2015 Other long-term liabilities Swiss Pension Plan USD ($)	May 02, 2015 Other long-term liabilities Swiss Pension Plan CHF	Jan. 31, 2015 Other long-term liabilities Swiss Pension Plan USD ($)	Jan. 31, 2015 Other long-term liabilities Swiss Pension Plan CHF
Components of net periodic defined benefit pension cost
Interest cost	$ 496,000	$ 572,000
Net amortization of unrecognized prior service credit	(58,000)	(58,000)
Net amortization of actuarial losses	428,000	234,000
Net periodic defined benefit pension cost	866,000	748,000	500,000	400,000
Cash surrender values of the insurance policies held in a rabbi trust									54,800,000	53,600,000
Gain as a result of changes in value of the insurance policy investments, included in other income							2,000,000	1,600,000
Realized gain resulting from payout on insurance policy investments							700,000
Projected benefit obligation			15,200,000	14,200,000	15,100,000	13,900,000					61,900,000	61,900,000
SERP benefit payments	400,000	0
Plan assets held at the independent fiduciary			12,600,000	11,800,000	12,500,000	11,500,000
Net liability													$ 2,600,000	2,400,000	$ 2,600,000	2,400,000