Acquisitions - Narrative (Details) - USD ($) $ in Thousands					3 Months Ended	6 Months Ended
	Feb. 01, 2018	Jul. 03, 2017	Apr. 03, 2017	Nov. 04, 2016	Dec. 31, 2017	Dec. 31, 2017	Jun. 30, 2017
Business Acquisition [Line Items]
Estimated fair value of goodwill					$ 384,785	$ 384,785	$ 380,846
RTL
Business Acquisition [Line Items]
Total purchase price		$ 5,798
Delta
Business Acquisition [Line Items]
Total purchase price			$ 40,500
Estimated fair value of goodwill			18,161
Intangible assets acquired, amortization period						15 years
Tax deductible goodwill					17,615	$ 17,615
Revenue of acquiree since acquisition date					5,229	10,761
Net income (loss) of acquiree since acquisition date					74	661
Cash paid at closing			40,500
Delta | Customer Relationships
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired			$ 8,000
Useful life of acquired assets			9 years
Delta | Developed Technology Rights
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired			$ 5,900
Useful life of acquired assets			7 years
Delta | Backlog
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired			$ 3,100
Useful life of acquired assets			2 years
CES Creative Electronic Systems S.A.
Business Acquisition [Line Items]
Estimated fair value of goodwill				$ 20,637
Revenue of acquiree since acquisition date					7,000	13,319
Net income (loss) of acquiree since acquisition date					$ 2,445	$ 2,093
Cash paid at closing				39,123
CES Creative Electronic Systems S.A. | Customer Relationships
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired				$ 9,060
Useful life of acquired assets				9 years
CES Creative Electronic Systems S.A. | Developed Technology Rights
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired				$ 5,662
Useful life of acquired assets				7 years
Themis Computer Acquisition | Subsequent Event
Business Acquisition [Line Items]
Total purchase price	$ 180,000