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Borrowings (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) D $ / shares	Mar. 31, 2021 USD ($)	Jul. 01, 2021 USD ($)	Jun. 30, 2021 USD ($)	Feb. 28, 2017 USD ($)
Borrowings
Borrowings outstanding		$ 73,000		$ 73,000
Increase to retained earnings		637,734		637,734			$ 548,842
Reduction in common stock		17		17			105,724
Revolving credit facility
Borrowings
Maximum borrowing capacity	$ 600,000
Credit facility under term loan	150,000			$ 100,000
Unused commitment fee (as a percent)				0.10%
Borrowings outstanding		73,000		$ 73,000
Available credit facility		441,800		$ 441,800
Revolving credit facility | Minimum
Borrowings
Maximum borrowing capacity	535,000
Unused commitment fee (as a percent)				0.10%
Revolving credit facility | Maximum
Borrowings
Maximum borrowing capacity	750,000
Increase in the credit agreement's borrowing capacity available under certain circumstances	250,000
Unused commitment fee (as a percent)				0.25%
Revolving credit facility | LIBOR
Borrowings
Interest rate margin (as a percent)				1.00%
Revolving credit facility | LIBOR | Minimum
Borrowings
Interest rate margin (as a percent)				1.00%
Revolving credit facility | LIBOR | Maximum
Borrowings
Interest rate margin (as a percent)				1.75%
Letters of credit sub facility
Borrowings
Maximum borrowing capacity	$ 300,000
Amount outstanding under letters of credit		85,200		$ 85,200
1.25% Convertible Senior Notes Due 2022
Borrowings
Principal amount		$ 287,500		$ 287,500				$ 287,500
Interest rate (as a percentage)		1.25%		1.25%
Conversion ratio				9.3056
Conversion price | $ / shares		$ 107.46		$ 107.46
Premium on stock price	38.50%
Threshold percentage of stock price				130.00%
Number of trading days | D				20
Number of consecutive trading days | D				30
Principal amount of the notes to be repurchased (as a percentage)				100.00%
Liability component of convertible debt		$ 242,400		$ 242,400
Equity component of convertible debt		45,100		45,100
Debt issuance costs		7,700		7,700
Debt Component of debt issuance costs		6,500		6,500
Equity component of debt issuance costs		1,200		1,200
Total interest expense		1,200	$ 3,300	3,700	$ 10,000
Contractual interest expense		900	900	2,700	2,700
Amortization of debt discount			2,200		6,400
Amortization of debt issuance costs		300	$ 300	1,000	$ 900
Unamortized discount							10,494
Unamortized debt issuance costs		600		600			$ 1,400
Principal value of notes repurchased and cancelled		40,200		40,200
Loss on debt extinguishment		100
Bank lines-of-credit
Borrowings
Amount outstanding under letters of credit		61,900		61,900
Available credit facility		11,500		11,500
Term Loan
Borrowings
Borrowings outstanding		$ 50,000		$ 50,000
ASU 2020-06 | Cumulative effect period of adoption, adjustment
Borrowings
Liability component of convertible debt						$ 10,000
Increase to retained earnings						19,000
Reduction in common stock						27,000
ASU 2020-06 | Cumulative effect period of adoption, adjustment | 1.25% Convertible Senior Notes Due 2022
Borrowings
Liability component of convertible debt						10,000
Increase to retained earnings						19,000
Reduction in common stock						$ 27,000

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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