Acquisitions - Net Purchase Price and Fair Values of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands					6 Months Ended
	Sep. 23, 2019	Apr. 18, 2019	Jan. 29, 2019	Jul. 31, 2018	Dec. 27, 2019	Dec. 31, 2018	Jun. 30, 2019	Jan. 31, 2019
Consideration transferred
Net purchase price					$ 96,502	$ 45,029
Estimated fair value of tangible assets acquired and liabilities assumed
Estimated goodwill					$ 614,648		$ 562,146
American Panel Corporation
Consideration transferred
Cash paid at closing	$ 100,826
Working capital and net debt adjustment	(5,952)
Liabilities assumed	2,454
Less cash acquired	(826)
Net purchase price	96,502
Estimated fair value of tangible assets acquired and liabilities assumed
Cash	826
Accounts receivable	3,726
Inventory	11,510
Fixed assets	690
Other current and non-current assets	3,494
Accounts payable	(1,554)
Accrued expenses	(1,070)
Other current and non-current liabilities	(5,749)
Estimated fair value of net tangible assets acquired	11,873
Estimated fair value of identifiable intangible assets	33,200
Estimated goodwill	52,255
Estimated fair value of net assets acquired	97,328
Cash Acquired from Acquisition	$ 826
The Athena Group, Inc. [Member]
Consideration transferred
Cash paid at closing		$ 34,049
Working capital and net debt adjustment		(446)
Less cash acquired		(49)
Net purchase price		33,554
Estimated fair value of tangible assets acquired and liabilities assumed
Cash		49
Accounts receivable		726
Fixed assets		74
Other current and non-current assets		260
Accounts payable		(48)
Accrued expenses		(143)
Other current and non-current liabilities		(600)
Deferred tax liability		(6,414)
Estimated fair value of net tangible assets acquired		(6,096)
Estimated fair value of identifiable intangible assets		23,700
Estimated goodwill		15,999
Estimated fair value of net assets acquired		33,603
Cash Acquired from Acquisition		49
Syntonic Microwave LLC
Consideration transferred
Cash paid at closing		13,118
Less cash acquired		(1,118)
Net purchase price		12,000
Estimated fair value of tangible assets acquired and liabilities assumed
Cash		1,118
Accounts receivable		281
Inventory		482
Fixed assets		31
Other current and non-current assets		6
Accounts payable		(71)
Accrued expenses		(61)
Estimated fair value of net tangible assets acquired		1,786
Estimated fair value of identifiable intangible assets		7,100
Estimated goodwill		4,232
Estimated fair value of net assets acquired		13,118
Cash Acquired from Acquisition		$ 1,118
GECO Avionics, LLC
Consideration transferred
Cash paid at closing			$ 36,500
Estimated fair value of tangible assets acquired and liabilities assumed
Accounts receivable								$ 1,320
Inventory								1,454
Fixed assets								459
Accounts payable								(217)
Accrued expenses								(239)
Estimated fair value of net tangible assets acquired								2,777
Estimated fair value of identifiable intangible assets								12,700
Estimated goodwill								21,023
Estimated fair value of net assets acquired								$ 36,500
Germane Systems
Consideration transferred
Cash paid at closing				$ 47,166
Working capital and net debt adjustment				(1,244)
Less cash acquired				(193)
Net purchase price				45,729
Estimated fair value of tangible assets acquired and liabilities assumed
Cash				193
Accounts receivable				4,277
Inventory				8,575
Fixed assets				867
Other current and non-current assets				596
Accounts payable				(3,146)
Accrued expenses				(1,394)
Other current and non-current liabilities				(514)
Estimated fair value of net tangible assets acquired				9,454
Estimated fair value of identifiable intangible assets				12,910
Estimated goodwill				23,558
Estimated fair value of net assets acquired				45,922
Cash Acquired from Acquisition				$ 193