Debt - Schedule of Long-Term Debt Outstanding (Details) - USD ($)	Mar. 31, 2025	Jun. 30, 2024
Debt Instrument [Line Items]
Long-term debt, net of current portion	$ 695,100,000	$ 694,200,000
Senior Notes
Debt Instrument [Line Items]
Total debt	695,100,000	694,200,000
Less: amounts due within one year	0	0
Long-term debt, net of current portion	$ 695,100,000	$ 694,200,000
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	$ 397,700,000	$ 397,200,000
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	$ 297,400,000	$ 297,000,000.0