Subsequent Events (Details) - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 01, 2019	Jul. 02, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Issuances of long-term debt, net of issuance costs					$ 878,100,000	$ 124,400,000
Revenues			$ 1,363,700,000	$ 1,440,900,000	$ 6,170,000,000.0	$ 6,378,100,000
Line of Credit | Subsequent Event
Business Acquisition [Line Items]
Proceeds from lines of credit	$ 600,000,000
Line of Credit | Letter of Credit | Subsequent Event
Business Acquisition [Line Items]
Maximum borrowing capacity		$ 10,000,000
Line of Credit | Revolving Credit Facility | Subsequent Event
Business Acquisition [Line Items]
Proceeds from lines of credit	300,000,000
Maximum borrowing capacity		$ 300,000,000
Debt instrument, term (in years)		5 years
Line of Credit | 5-Year Term Loan | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Long term debt		$ 250,000,000
Repayment in year four, percent		15.00%
Repayment in year five, percent		15.00%
Debt instrument, term (in years)		5 years
Line of Credit | 3-Year Term Loan | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Issuances of long-term debt, net of issuance costs	$ 300,000,000
Long term debt		$ 300,000,000
Debt instrument, term (in years)		3 years
Minimum | London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		1.375%
Minimum | London Interbank Offered Rate (LIBOR) | Line of Credit | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		1.375%
Minimum | London Interbank Offered Rate (LIBOR) | Line of Credit | 3-Year Term Loan | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		1.125%
Minimum | Prime Rate | Line of Credit | Revolving Credit Facility | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		0.375%
Minimum | Prime Rate | Line of Credit | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		0.375%
Minimum | Prime Rate | Line of Credit | 3-Year Term Loan | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		0.125%
Maximum | London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		2.50%
Maximum | London Interbank Offered Rate (LIBOR) | Line of Credit | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		2.50%
Maximum | London Interbank Offered Rate (LIBOR) | Line of Credit | 3-Year Term Loan | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		2.25%
Maximum | Prime Rate | Line of Credit | Revolving Credit Facility | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		1.50%
Maximum | Prime Rate | Line of Credit | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		1.50%
Maximum | Prime Rate | Line of Credit | 3-Year Term Loan | Term Loan | Subsequent Event
Business Acquisition [Line Items]
Basis spread on variable rate		1.25%
September 30, 2019 through March 31, 2021 | Subsequent Event
Business Acquisition [Line Items]
Debt instrument, covenant, total indebtedness to EBITDA ratio, maximum		4.50
June 30, 2021 through March 31, 2022 | Subsequent Event
Business Acquisition [Line Items]
Debt instrument, covenant, total indebtedness to EBITDA ratio, maximum		4.25
June 30, 2022 through final maturity | Subsequent Event
Business Acquisition [Line Items]
Debt instrument, covenant, total indebtedness to EBITDA ratio, maximum		4.00
Debt instrument, covenant, EBITDA to consolidated interest expense ratio, minimum		3.50
CMG
Business Acquisition [Line Items]
Revenues							$ 80,000,000
Pennant
Business Acquisition [Line Items]
Revenues							$ 50,000,000
Wholly owned subsidiary | CMG | Pennant | Subsequent Event
Business Acquisition [Line Items]
Voting interest acquired	47.00%
Amount of cash paid at closing		$ 1,275,000,000