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Indebtedness - Narrative (Details)			1 Months Ended			3 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 ($) instrument	Jan. 31, 2020 USD ($)	Feb. 01, 2019 USD ($)	Oct. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 27, 2019 USD ($)	Jun. 01, 2018 USD ($)	May 31, 2018 USD ($)
Debt Instrument [Line Items]
Fiscal 2020 (remainder)						$ 0.0
Fiscal 2021						0.0
Fiscal 2022						9,000,000.0
Fiscal 2023						132,000,000.0
Fiscal 2024						153,000,000.0
Fiscal 2025						0.0
After fiscal 2025						425,000,000.0
Long-term debt						714,919,000	$ 312,551,000	$ 700,813,000
Amortization payment percentage			2.50%
Current portion of long-term debt						(113,903,000)	0	(79,914,000)
Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross						100,000,000	100,000,000	100,000,000
Senior Notes
Debt Instrument [Line Items]
Interest expense, debt						2,100,000	2,100,000
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, gross						$ 123,931,000	123,869,000	123,916,000
Long-term debt					$ 100,000,000.0
Debt instrument, interest rate, stated percentage					7.80%	7.80%
Interest expense, debt						$ 2,000,000.0	$ 2,000,000
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
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
Long-term debt, gross						14,000,000	$ 91,000,000	0
Debt instrument, unused borrowing capacity, amount						584,100,000	507,500,000	598,100,000
Interest expense, debt						100,000	800,000
Senior Notes
Debt Instrument [Line Items]
Payments of debt issuance costs			$ 600,000
Interest expense, debt						1,900,000
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
Debt instrument, face amount			$ 200,000,000.0
Repayments of long-term lines of credit						100,000,000.0
Senior Notes \| $300 million term loan
Debt Instrument [Line Items]
Debt instrument, term			5 years
Long-term debt, gross						180,000,000		180,000,000
Debt instrument, face amount			$ 300,000,000.0
Principal payment requirement term			3 years 3 months
Repayments of long-term lines of credit						120,000,000.0
Current portion of long-term debt						(99,900,000)
Senior Notes \| 3.81% series A senior notes
Debt Instrument [Line Items]
Long-term debt, gross						$ 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%					3.81%
Senior Notes \| 3.91% series B senior notes
Debt Instrument [Line Items]
Long-term debt, gross						$ 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%					3.91%
Senior Notes \| Series A and Series B Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross						$ 200,000,000.0
Debt issuance costs, gross									$ 700,000
Interest expense, debt						$ 1,900,000
Senior Notes \| Series A and Series B Senior Notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	10.00%
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%
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%
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	$ 1,500,000	$ 1,900,000
Bridge Loan \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility				$ 30,000,000.0