Stock Incentive Plans - Weighted average assumptions used in fair value of each stock appreciation right award granted (Details) - Stock Appreciation Rights (SARs) - $ / shares	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	3.00%	0.80%	0.40%
Expected life of award	5 years 7 months 6 days	5 years 7 months 6 days	5 years 4 months 24 days
Expected dividend yield of stock	1.80%	1.90%	2.00%
Expected volatility of stock	37.10%	35.70%	35.20%
Weighted-average fair value (in USD per share)	$ 97.70	$ 81.71	$ 53.92