Deferred Compensation and Other Benefits - Additional Information (Details) - USD ($)	3 Months Ended					9 Months Ended
	Sep. 29, 2017	Mar. 31, 2017	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Sep. 29, 2017	Sep. 30, 2016	Jun. 30, 2017
ESBP [Member]
Deferred Compensation Text Details [Line Items]
Benefit plan, employer contributions	$ 100,000					$ 500,000
Estimated 2017 full year benefit payments								$ 700,000
NDBP [Member]
Deferred Compensation Text Details [Line Items]
Net periodic pension cost	15,000		$ 18,000			$ 44,000	$ 55,000
Targeted minimum return						4.00%
Guaranteed return						4.00%
Belgium Pension Plan [Member]
Deferred Compensation Text Details [Line Items]
Net periodic pension cost	30,000					$ 89,000
Increase to noncurrent assets and offsetting adjustment to direct costs						300,000
Increase in income tax expense and deferred tax liabilities						$ 100,000
Key Employee Non Qualified Deferred Compensation Plan [Member]
Deferred Compensation Text Details [Line Items]
Benefit plan, employer contributions		$ 100,000			$ 200,000
Key Employee Non Qualified Deferred Compensation Plan [Member] | Deferred Compensation and Other Benefits [Member]
Deferred Compensation Text Details [Line Items]
Common stock units issued under plan			0	0	5,000	0
Non Employee Director Deferred Compensation Plan [Member]
Deferred Compensation Text Details [Line Items]
Benefit plan, employer contributions	$ 100,000					$ 300,000