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Defined Benefit Plans (Tables) | 6 Months Ended
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Jul. 29, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Components of net periodic defined benefit pension cost related to the Company's defined benefit plans | The components of net periodic defined benefit pension cost for the three and six months ended July 29, 2017 and July 30, 2016 related to the Company’s defined benefit plans are as follows (in thousands):
| Three Months Ended July 29, 2017
| SERP |  | Swiss Pension Plan |  | Total
Service cost | $ | — |  |  | $ | 469 |  |  | $ | 469 |
Interest cost | 460 |  |  | 20 |  |  | 480 |
Expected return on plan assets | — |  |  | (46 | ) |  | (46 | )
Net amortization of unrecognized prior service credit | — |  |  | (6 | ) |  | (6 | )
Net amortization of actuarial losses | 38 |  |  | 73 |  |  | 111 |
Net periodic defined benefit pension cost | $ | 498 |  |  | $ | 510 |  |  | $ | 1,008 |
| Six Months Ended July 29, 2017
| SERP |  | Swiss Pension Plan |  | Total
Service cost | $ | — |  |  | $ | 960 |  |  | $ | 960 |
Interest cost | 921 |  |  | 42 |  |  | 963 |
Expected return on plan assets | — |  |  | (95 | ) |  | (95 | )
Net amortization of unrecognized prior service credit | — |  |  | (13 | ) |  | (13 | )
Net amortization of actuarial losses | 76 |  |  | 152 |  |  | 228 |
Net periodic defined benefit pension cost | $ | 997 |  |  | $ | 1,046 |  |  | $ | 2,043 |
| Three Months Ended July 30, 2016
| SERP |  | Swiss Pension Plan |  | Total
Service cost | $ | — |  |  | $ | 392 |  |  | $ | 392 |
Interest cost | 460 |  |  | 22 |  |  | 482 |
Expected return on plan assets | — |  |  | (47 | ) |  | (47 | )
Net amortization of unrecognized prior service credit | — |  |  | (7 | ) |  | (7 | )
Net amortization of actuarial losses | 38 |  |  | 47 |  |  | 85 |
Net periodic defined benefit pension cost | $ | 498 |  |  | $ | 407 |  |  | $ | 905 |
| Six Months Ended July 30, 2016
| SERP |  | Swiss Pension Plan |  | Total
Service cost | $ | — |  |  | $ | 771 |  |  | $ | 771 |
Interest cost | 920 |  |  | 44 |  |  | 964 |
Expected return on plan assets | — |  |  | (93 | ) |  | (93 | )
Net amortization of unrecognized prior service credit | — |  |  | (14 | ) |  | (14 | )
Net amortization of actuarial losses | 77 |  |  | 94 |  |  | 171 |
Net periodic defined benefit pension cost | $ | 997 |  |  | $ | 802 |  |  | $ | 1,799 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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