Debt - Schedule of Long-Term Debt Outstanding (Details) - USD ($)	Sep. 30, 2025	Jun. 30, 2025
Debt Instrument [Line Items]
Long-term debt, net of current portion	$ 695,700,000	$ 695,400,000
Senior Notes
Debt Instrument [Line Items]
Total debt	695,700,000	695,400,000
Less: amounts due within one year	0	0
Long-term debt, net of current portion	$ 695,700,000	$ 695,400,000
Senior unsecured notes, 6.375% due July 2028 | Senior Notes
Debt Instrument [Line Items]
Interest rate	6.375%	6.375%
Face amount	$ 400,000,000.0	$ 400,000,000.0
Total debt	$ 398,100,000	$ 397,900,000
Senior unsecured notes, 7.625% due March 2030
Debt Instrument [Line Items]
Interest rate	7.625%	7.625%
Face amount	$ 300,000,000.0	$ 300,000,000.0
Total debt	$ 297,600,000	$ 297,500,000