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Note 11 - Financing Agreements (Details Textual) $ in Thousands							3 Months Ended				6 Months Ended
		Sep. 30, 2020 USD ($)	Jun. 19, 2020 USD ($)	Apr. 16, 2020 USD ($)	Aug. 30, 2019 USD ($)	Feb. 28, 2019 USD ($)	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Debt Instrument, Covenant, Maximum First Lien Net Leverage Ratio				2.00
Write off of Deferred Debt Issuance Cost									$ 5,000		$ 5,000
Revolving Credit Facility [Member]
Proceeds from Debt, Net of Issuance Costs					$ 100,000
Debt Issuance Costs, Gross													$ 4,000
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,000,000	$ 750,000
Debt Instrument, Covenant, Maximum First Lien Net Leverage Ratio									2.50
Long-term Line of Credit, Total									$ 0		0
Letters of Credit Outstanding, Amount									21,000		21,000
Line of Credit Facility, Remaining Borrowing Capacity									$ 979,000		$ 979,000
Term Facility [Member]
Debt Issuance Costs, Gross													$ 13,000
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 275,000
Line of Credit Facility, Commitment Fee Percentage						0.125%
Forecast [Member]
Debt Instrument, Covenant, Maximum First Lien Net Leverage Ratio							2.00	4.00
Senior Notes due April 15, 2025 [Member]
Debt Instrument, Interest Rate, Stated Percentage	[1]								5.75%		5.75%
Senior Notes due June 1, 2026 [Member]
Debt Instrument, Interest Rate, Stated Percentage	[1]								6.50%		6.50%
Senior Notes due June 15, 2028 [Member]
Debt Instrument, Face Amount									$ 400,000		$ 400,000
Debt Instrument, Interest Rate, Stated Percentage									5.625%		5.625%
Proceeds from Debt, Net of Issuance Costs											$ 395,000
Debt Issuance Costs, Gross									$ 5,000		$ 5,000
Debt Instrument, Redemption Price, Percentage											100.00%
Senior Notes due June 15, 2028 [Member] | Redeem up to 35% of Aggregate Principle Amount [Member]
Debt Instrument, Redemption Price, Percentage											105.625%
Senior Notes due November 15, 2027 [Member]
Debt Instrument, Interest Rate, Stated Percentage									5.375%		5.375%
Proceeds from Debt, Net of Issuance Costs											$ 99,000
Debt Issuance Costs, Gross									$ 1,000		1,000
Long-term Debt, Gross, Additional Amount									$ 100,000		$ 100,000
Debt Instrument, Redemption Price, Percentage											100.00%
Senior Notes due November 15, 2027 [Member] | Redeem up to 35% of Aggregate Principle Amount [Member]
Debt Instrument, Redemption Price, Percentage											105.375%
The Term A Facility [Member]
Proceeds from Debt, Net of Issuance Costs						$ 225,000
Line of Credit Facility, Maximum Borrowing Capacity						500,000
Line of Credit Facility, Periodic Payment						8,000
Debt Instrument, Covenant, Maximum First Lien Net Leverage Ratio									2.50
Line of Credit Facility, Interest Rate at Period End									2.75%		2.75%
The Term A Facility [Member] | Forecast [Member]
Line of Credit Facility, Periodic Payment		$ 7,000
The Term B Facility [Member]
Proceeds from Debt, Net of Issuance Costs						450,000
Line of Credit Facility, Maximum Borrowing Capacity						$ 450,000
Line of Credit Facility, Periodic Payment, Principal, Percentage						0.25%
Line of Credit Facility, Interest Rate at Period End									2.43%		2.43%
The Term B Facility [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate						1.25%
The Term B Facility [Member] | Eurodollar [Member]
Debt Instrument, Basis Spread on Variable Rate						2.25%
Bridge Facility [Member]
Debt Instrument, Face Amount				$ 500,000
Debt Issuance Costs, Gross				$ 5,000
Write off of Deferred Debt Issuance Cost			$ 5,000
Currency Swap [Member] | Senior Notes due April 15, 2025 [Member] | Cash Flow Hedging [Member]
Derivative, Term of Contract (Year)											8 years
Derivative, Fixed Interest Rate									3.85%		3.85%
Debt Instrument, Interest Rate, Stated Percentage									5.75%		5.75%
Currency Swap [Member] | Senior Notes due June 1, 2026 [Member] | Cash Flow Hedging [Member]
Derivative, Term of Contract (Year)											10 years
Derivative, Fixed Interest Rate									5.14%		5.14%
Debt Instrument, Interest Rate, Stated Percentage									6.50%		6.50%
[1] In conjunction with the issuance of the April 2025 Notes we entered into 8-year fixed-to-fixed cross-currency swaps which have the effect of economically converting the April 2025 Notes to euro-denominated debt at a fixed rate of 3.850%. In conjunction with the issuance of the June 2026 Notes we entered into 10-year fixed-to-fixed cross-currency swaps which have the effect of economically converting the June 2026 Notes to euro-denominated debt at a fixed rate of 5.140%. See Note 12 for additional information.

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The maximum first lien net leverage ratio under debt instrument covenant.

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Face (par) amount of debt instrument at time of issuance.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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