Acquisitions - Synkera and ZMDI Narrative (Details) - USD ($) $ in Thousands			3 Months Ended								12 Months Ended
	Jul. 22, 2016	Dec. 07, 2015	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 01, 2018	Apr. 02, 2017	Apr. 03, 2016
Business Acquisition [Line Items]
Revenues			$ 224,578	$ 217,075	$ 204,398	$ 196,713	$ 175,698	$ 176,358	$ 184,059	$ 192,128	$ 842,764	$ 728,243	$ 697,376
Synkera Technologies, Inc.
Business Acquisition [Line Items]
Total purchase price	$ 2,800
Cash paid at closing	1,500
Fair value of contingent cash consideration	1,300
Contingent cash consideration (up to)	$ 1,500
Period of cash consideration paid upon achievement of certain milestones (in years)	3 years 6 months
ZMDI
Business Acquisition [Line Items]
Total purchase price		$ 307,030
Cash paid at closing		307,030
Escrow deposit		$ 20,000
Revenues												24,400
ZMDI | Selling, General and Administrative Expenses
Business Acquisition [Line Items]
Acquisition related costs incurred												$ 2,500