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Indebtedness - Narrative (Details)			1 Months Ended			3 Months Ended		4 Months Ended	9 Months Ended
Indebtedness - Narrative (Details)	Apr. 30, 2019 USD ($)	Apr. 26, 2007 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 1997 USD ($) instrument	Aug. 02, 2019 USD ($)	Aug. 03, 2018 USD ($)	Aug. 02, 2019 USD ($)	Aug. 02, 2019 USD ($)	Aug. 03, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 27, 2019 USD ($)	Oct. 31, 2018 USD ($)	May 31, 2018 USD ($)
Debt Instrument [Line Items]
Fiscal 2019 (remainder)						$ 0.0		$ 0.0	$ 0.0
Fiscal 2020						0.0		0.0	0.0
Fiscal 2021						0.0		0.0	0.0
Fiscal 2022						115,000,000.0		115,000,000.0	115,000,000.0
Fiscal 2023						30,000,000.0		30,000,000.0	30,000,000.0
Fiscal 2024						155,000,000.0		155,000,000.0	155,000,000.0
After fiscal 2024						425,000,000.0		425,000,000.0	425,000,000.0
Long-term debt						720,681,000	$ 312,481,000	720,681,000	720,681,000	$ 312,481,000			$ 312,549,000
Amortization Payment Percentage			2.50%
Current portion of long-term debt						(99,877,000)	0	(99,877,000)	(99,877,000)	0			0
Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross						100,000,000	100,000,000	100,000,000	100,000,000	100,000,000			100,000,000
Debt Securities Issued In June1997
Debt Instrument [Line Items]
Debt instrument, face amount					$ 175,000,000.0
6.625% senior notes
Debt Instrument [Line Items]
Debt instrument, term					30 years
Long-term debt					$ 100,000,000.0
Long-term debt, gross						123,900,000	$ 123,838,000	123,900,000	123,900,000	123,838,000			123,854,000
Debt instrument, interest rate, stated percentage					7.80%
Payment made to terminate interest rate derivatives					$ 23,700,000
Number of interest rate derivatives held \| instrument					3
Derivative, notional amount					$ 125,000,000.0
Deferred income earned on swap balance at termination					$ 18,700,000
Coupon 7.125 Percent Debt Notes
Debt Instrument [Line Items]
Debt instrument, term					10 years
Debt instrument, face amount					$ 75,000,000.0
Debt instrument, interest rate, stated percentage					7.125%
6.625% senior notes
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.30%
Line of Credit
Debt Instrument [Line Items]
Debt instrument, term							5 years
Interest Expense, Debt						200,000	$ 400,000		1,900,000	400,000
Maximum borrowing capacity under credit facility				$ 600,000,000.0										$ 150,000,000.0
Line of credit facility, maximum borrowing capacity, accordion feature				300,000,000.0
Payments of debt issuance costs				1,900,000
Debt instrument, unused borrowing capacity, amount						598,100,000	507,400,000	598,100,000	598,100,000	507,400,000			507,500,000
Long-term debt, gross						0	91,000,000	0	0	91,000,000			91,000,000
Senior Notes
Debt Instrument [Line Items]
Interest Expense, Debt						3,700,000			5,300,000
Payments of debt issuance costs			$ 600,000
Senior Notes \| $200 million term loan
Debt Instrument [Line Items]
Debt instrument, term			3 years
Long-term debt, gross						100,000,000		100,000,000	100,000,000
Debt instrument, face amount			$ 200,000,000.0
Repayments of long-term lines of credit								100,000,000.0
Current portion of long-term debt						(99,900,000)		(99,900,000)	(99,900,000)
Senior Notes \| $300 million term loan
Debt Instrument [Line Items]
Debt instrument, term			5 years
Long-term debt, gross						200,000,000		200,000,000	200,000,000
Debt instrument, face amount			$ 300,000,000.0
Repayments of long-term lines of credit								100,000,000.0
Senior Notes \| 3.81% series A senior notes
Debt Instrument [Line Items]
Long-term debt, gross						100,000,000		100,000,000	100,000,000
Debt instrument, face amount	$ 100,000,000.0											$ 100,000,000.0
Debt instrument, interest rate, stated percentage	3.81%
Senior Notes \| 3.91% series B senior notes
Debt Instrument [Line Items]
Long-term debt, gross						100,000,000		100,000,000	100,000,000
Debt instrument, face amount	$ 100,000,000.0											$ 100,000,000.0
Debt instrument, interest rate, stated percentage	3.91%
Senior Notes \| Series A and Series B Senior Notes
Debt Instrument [Line Items]
Interest Expense, Debt						800,000			800,000
Long-term debt, gross						$ 200,000,000.0		$ 200,000,000.0	$ 200,000,000.0
Debt Issuance Costs, Gross											$ 700,000
Senior Notes \| Series A and Series B Senior Notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
Senior Notes \| Series A and Series B Senior Notes \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
Senior Notes \| Series A and Series B Senior Notes \| Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
Senior Notes \| 6.625% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 125,000,000.0
Debt instrument, interest rate, stated percentage		6.625%				6.625%		6.625%	6.625%
Debt instrument issuance price as percentage of par value		98.513%
Debt instrument, unamortized discount		$ 1,900,000
Unamortized debt issuance expense		$ 1,500,000
Debt instrument, interest rate, effective percentage						6.741%		6.741%	6.741%
Debt instrument, repurchase offer due to change of control and downgrade of notes below an investment grade rating, percentage of principal									101.00%
Standby Letters of Credit \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility				10,000,000.0
Long-term debt						$ 1,900,000	$ 1,600,000	$ 1,900,000	$ 1,900,000	$ 1,600,000			$ 1,500,000
Bridge Loan \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility				$ 30,000,000.0