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Employee Benefit Plans (Details) - USD ($)
12 Months Ended
Dec. 30, 2016
Jan. 01, 2016
Jan. 02, 2015
Change in Plan Assets:      
Plan assets at fair value, beginning of period $ 3,500,000    
Employer contributions 703,000 $ 625,000 $ 518,000
Plan assets at fair value, end of period 3,600,000 3,500,000  
Swiss Plan [Member]      
Change in Projected Benefit Obligation:      
Projected benefit obligation, beginning of period 6,349,000 4,827,000  
Service cost 469,000 316,000  
Interest cost 65,000 74,000  
Participant contributions 230,000 209,000  
Benefits paid (340,000) 340,000  
Actuarial gain (410,000) 656,000  
Prior service cost 0 (73,000)  
Projected benefit obligation, end of period 6,363,000 6,349,000 4,827,000
Change in Plan Assets:      
Plan assets at fair value, beginning of period 3,498,000 2,705,000  
Actual return on plan assets (13,000) 35,000  
Employer contributions 230,000 209,000  
Participant contributions 230,000 209,000  
Benefits paid (340,000) 340,000  
Plan assets at fair value, end of period 3,606,000 3,498,000 2,705,000
Funded status (pension liability), end of year (2,757,000) (2,851,000)  
Amount Recognized in Accumulated Other Comprehensive Loss, net of tax:      
Actuarial loss on plan assets (822,000) (822,000)  
Actuarial loss on benefit obligation (1,393,000) (1,668,000)  
Actuarial gain (loss) 454,000 362,000  
Effect of curtailments 606,000 606,000  
Accumulated other comprehensive loss (1,155,000) (1,522,000)  
Accumulated benefit obligation at end of year (5,980,000) (5,932,000)  
Japan Plan [Member]      
Change in Projected Benefit Obligation:      
Projected benefit obligation, beginning of period 1,035,000 957,000  
Service cost 148,000 121,000  
Interest cost 6,000 6,000  
Benefits paid (17,000) (83,000)  
Actuarial gain 49,000 32,000  
Foreign exchange adjustment 19,000 2,000  
Projected benefit obligation, end of period 1,240,000 1,035,000 957,000
Change in Plan Assets:      
Plan assets at fair value, beginning of period 0 0  
Actual return on plan assets 0 0  
Employer contributions 0 0  
Benefits paid 0 0  
Distribution of plan assets 0 0  
Foreign exchange adjustment 0 0  
Plan assets at fair value, end of period 0 0 $ 0
Funded status (pension liability), end of year (1,240,000) (1,035,000)  
Amount Recognized in Accumulated Other Comprehensive Loss, net of tax:      
Transition obligation (14,000) (20,000)  
Actuarial gain (loss) (31,000) 122,000  
Prior service cost 8,000 9,000  
Net gain (loss) 125,000 (10,000)  
Accumulated other comprehensive loss 88,000 101,000  
Accumulated benefit obligation at end of year $ (1,078,000) $ (893,000)