Debt - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
	Sep. 28, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Long-term debt		$ 276,500,000		$ 276,500,000		$ 195,000,000
Interest expense		2,473,000	$ 999,000	6,928,000	$ 1,101,000
Amount of outstanding letter of credit		2,300,000		2,300,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 750,000,000
Term of revolving credit facility	5 years
Long-term debt		276,500,000		276,500,000
Interest expense		2,473,000		6,928,000
Term Loan
Debt Instrument [Line Items]
Debt issuance costs		$ 6,049,000		6,049,000
Germane Systems | Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from lines of credit				45,000,000
GECO Avionics, LLC | Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from lines of credit				$ 36,500,000