Acquisitions - Net Purchase Price and Fair Values of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands			6 Months Ended
	Apr. 03, 2017	Nov. 04, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Consideration transferred
Net purchase price			$ 5,798	$ 38,764
Estimated fair value of tangible assets acquired and liabilities assumed
Estimated fair value of goodwill			$ 384,785		$ 380,846
Delta
Consideration transferred
Cash paid at closing	$ 40,500
Net purchase price	40,500
Estimated fair value of tangible assets acquired and liabilities assumed
Accounts receivable and cost in excess of billings	957
Inventory	4,452
Fixed assets	1,918
Other current and non-current assets	67
Current liabilities	(2,055)
Fair value of net tangible assets acquired	5,339
Fair value of identifiable intangible assets	17,000
Estimated fair value of goodwill	18,161
Estimated fair value of assets acquired	40,500
Net purchase price	$ 40,500
CES Creative Electronic Systems S.A.
Consideration transferred
Cash paid at closing		$ 39,123
Working capital adjustment		(330)
Net purchase price		38,793
Estimated fair value of tangible assets acquired and liabilities assumed
Accounts receivable and cost in excess of billings		2,698
Inventory		8,950
Fixed assets		1,480
Other current and non-current assets		748
Current liabilities		(3,154)
Non-current liabilities		(6,140)
Deferred tax liabilities		(1,148)
Fair value of net tangible assets acquired		3,434
Fair value of identifiable intangible assets		14,722
Estimated fair value of goodwill		20,637
Estimated fair value of assets acquired		$ 38,793