Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		22 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019
Restructuring Reserve [Roll Forward]
Restructuring costs	$ 206	$ 1,804	$ 472	$ 3,497
Aerospace
Restructuring Reserve [Roll Forward]
Severance costs		300		1,200
Distribution [Member]
Restructuring Reserve [Roll Forward]
Severance costs		100
2017 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	9,500		9,500		$ 9,500
Total cost savings			4,000
Restructuring Reserve [Roll Forward]
Restructuring accrual balance, beginning of period			1,580
Provision			181
Cash payments			(1,155)
Changes in foreign currency exchange rates			(23)
Restructuring accrual balance, end of period	583		583		583
Restructuring costs					9,100
2017 Announced Restructuring Plan [Member] | Aerospace
Restructuring Reserve [Roll Forward]
Provision	200	$ 1,500	500	$ 2,300
2017 Announced Restructuring Plan [Member] | Severance
Restructuring Reserve [Roll Forward]
Restructuring accrual balance, beginning of period			1,022
Provision			(15)
Cash payments			(777)
Changes in foreign currency exchange rates			(8)
Restructuring accrual balance, end of period	222		222		222
2017 Announced Restructuring Plan [Member] | Other
Restructuring Reserve [Roll Forward]
Restructuring accrual balance, beginning of period			558
Provision			196
Cash payments			(378)
Changes in foreign currency exchange rates			(15)
Restructuring accrual balance, end of period	361		361		$ 361
Write-off of inventory	$ 200		$ 300