Debt - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Sep. 28, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Debt Instrument [Line Items]
Long-term debt		$ 240,000,000		$ 240,000,000		$ 195,000,000
Interest expense		2,196,000	$ 107,000	4,455,000	$ 110,000
Amount of outstanding letter of credit		2,351,000		2,351,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 750,000,000
Term of revolving credit facility	5 years
Proceeds from lines of credit				45,000,000
Long-term debt		240,000,000		240,000,000
Interest expense		2,196,000		4,455,000
Term Loan
Debt Instrument [Line Items]
Debt issuance costs		$ 6,385,000		$ 6,385,000