Special Charges/Recoveries (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Restructuring Reserve [Roll Forward]
Restructuring Reserve Beginning of Period	$ 1,418	$ 652	$ 1,618	$ 663
Restructuring Charges	3,566	3,259	5,025	4,422
Other Nonrecurring (Income) Expense	(5,520)	1,335	(7,788)	2,111
Special charges paid	(2,866)	(3,220)	(4,525)	(4,394)
Restructuring Reserve End of Period	2,118	691	2,118	691
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	195	1,383	427	2,272
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	2,197	1,304	2,699	1,443
Acquisitions [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	136	(48)	136	(161)
Energy [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	1,947	525	2,969	247
Other Nonrecurring (Income) Expense	(9,505)	1,383	(11,773)	2,270
Energy [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		(113)		(489)
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	195	1,383	427	2,270
Energy [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	803	638	975	736
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down		1,400		2,300
Energy [Member] | Acquisitions [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		0		0
Aerospace [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		2,068		3,468
Aerospace [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		666		707
Aerospace [Member] | Acquisitions [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		(48)		(161)
Corporate [Member]
Restructuring Reserve [Roll Forward]
Other Nonrecurring (Income) Expense	237	0	237	2
Corporate [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down				2
Corporate [Member] | Acquisitions [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	$ 136	$ 0	$ 136	$ 0