Defined Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016	Jan. 28, 2017
Components of net periodic defined benefit pension cost
Service cost	$ 469	$ 392	$ 960	$ 771
Interest cost	480	482	963	964
Expected return on plan assets	(46)	(47)	(95)	(93)
Net amortization of unrecognized prior service credit	(6)	(7)	(13)	(14)
Net amortization of actuarial losses	111	85	228	171
Net periodic defined benefit pension cost	1,008	905	2,043	1,799
SERP
Defined Benefit Plans
SERP benefit payments	400	400	800	800
Components of net periodic defined benefit pension cost
Service cost	0	0	0	0
Interest cost	460	460	921	920
Expected return on plan assets	0	0	0	0
Net amortization of unrecognized prior service credit	0	0	0	0
Net amortization of actuarial losses	38	38	76	77
Net periodic defined benefit pension cost	498	498	997	997
Swiss Pension Plan \| Switzerland
Defined Benefit Plans
Projected benefit obligation	19,000		19,000		$ 17,600
Plan assets at fair value	15,400		15,400		14,100
Components of net periodic defined benefit pension cost
Service cost	469	392	960	771
Interest cost	20	22	42	44
Expected return on plan assets	(46)	(47)	(95)	(93)
Net amortization of unrecognized prior service credit	(6)	(7)	(13)	(14)
Net amortization of actuarial losses	73	47	152	94
Net periodic defined benefit pension cost	510	407	1,046	802
Other income/expense \| SERP
Defined Benefit Plans
Gains as a result of changes in value of the insurance policy investments, included in other income	1,900	$ 1,900	3,800	$ 5,100
Other assets \| SERP
Defined Benefit Plans
Cash surrender values of the insurance policies held in a rabbi trust	61,600		61,600		58,600
Accrued expenses and other long-term liabilities \| SERP
Defined Benefit Plans
Projected benefit obligation	53,600		53,600		53,500
Other long-term liabilities \| Swiss Pension Plan \| Switzerland
Defined Benefit Plans
Net liability	$ 3,600		$ 3,600		$ 3,500

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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- Definition

The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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No definition available.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

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The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period.

+ References

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