Employee Benefits - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details) - $ / shares	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Employee Benefits
Expected dividend yield	1.83%	1.60%	1.51%
Expected volatility	27.72%	22.55%	20.39%
Risk-free interest rate	1.14%	1.55%	2.67%
Weighted-average expected life (years)	10 years	10 years	10 years
Weighted-average fair value of options granted during the year	$ 9.19	$ 8.81	$ 8.78