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Stock Incentive Plans - Information related to stock appreciation rights awards exercised (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Net cash proceeds $ 2,623 $ 2,475 $ 3,682
Stock Appreciation Rights (SARs)      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Net cash proceeds 2,623 2,475 3,682
Intrinsic value 133,641 95,502 136,000
Income tax benefit $ 21,132 $ 15,584 $ 28,701
Number of shares surrendered 228,986 158,610 269,670