Stock Incentive Plans - Information related to stock appreciation rights awards exercised (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020		Jun. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Net cash proceeds	$ 4,684	$ 2,623	[1]	$ 2,475	[1]
Stock Appreciation Rights (SARs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Net cash proceeds	4,684	2,623		2,475
Intrinsic value	225,025	133,641		95,502
Income tax benefit	$ 37,437	$ 21,132		$ 15,584
Number of shares surrendered	316,330	228,986		158,610

[1] *Years ended June 30, 2020 and 2019 amounts have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 7 to the Consolidated Financial Statements.