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Share-Based Compensation - Equity-Settled Plans, Narrative (Details) - $ / shares
12 Months Ended
Feb. 16, 2017
Jun. 30, 2024
Jun. 30, 2018
Jun. 30, 2023
Jun. 30, 2022
Feb. 02, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Company's common stock purchased in aggregate (in shares)   72,000   72,000 92,000  
2010 Long-Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum common stock issued under Long-Term Incentive Plan (in shares)           475,000
2017 Long-Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of additional shares authorized   1,138,000 650,000      
Maximum common stock issued under Long-Term Incentive Plan (in shares)   5,100,000        
Exercise price of outstanding stock options (dollars per share)   $ 4.44        
Vesting period   3 years        
Company's common stock purchased in aggregate (in shares)   100,000        
2017 Long Term Incentive Plan Excluding 2010 Long Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum common stock issued under Long-Term Incentive Plan (in shares)           4,630,000
Contractual term of stock options granted 10 years