Employee Benefits - Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable (Details)	12 Months Ended
	Jun. 30, 2023 $ / shares shares
14 mo.
Defined Contribution Plan Disclosure [Line Items]
Weighted Average Remaining Contractual Life	14 months
Options Outstanding, Number | shares	10,000
Options Outstanding, Weighted Average Exercise Price	$ 17.55
Options Exercisable, Number | shares	10,000
Options Exercisable, Weighted Average Exercise Price	$ 17.55
55 mo.
Defined Contribution Plan Disclosure [Line Items]
Weighted Average Remaining Contractual Life	55 months
Options Outstanding, Number | shares	13,500
Options Outstanding, Weighted Average Exercise Price	$ 37.31
Options Exercisable, Number | shares	13,500
Options Exercisable, Weighted Average Exercise Price	$ 37.31
66 mo.
Defined Contribution Plan Disclosure [Line Items]
Weighted Average Remaining Contractual Life	66 months
Options Outstanding, Number | shares	17,500
Options Outstanding, Weighted Average Exercise Price	$ 34.35
Options Exercisable, Number | shares	14,000
Options Exercisable, Weighted Average Exercise Price	$ 34.35
80 mo.
Defined Contribution Plan Disclosure [Line Items]
Weighted Average Remaining Contractual Life	80 months
Options Outstanding, Number | shares	19,500
Options Outstanding, Weighted Average Exercise Price	$ 37.40
Options Exercisable, Number | shares	11,700
Options Exercisable, Weighted Average Exercise Price	$ 37.40
91 mo.
Defined Contribution Plan Disclosure [Line Items]
Weighted Average Remaining Contractual Life	91 months
Options Outstanding, Number | shares	29,000
Options Outstanding, Weighted Average Exercise Price	$ 34.91
Options Exercisable, Number | shares	11,600
Options Exercisable, Weighted Average Exercise Price	$ 34.91
103 mo.
Defined Contribution Plan Disclosure [Line Items]
Weighted Average Remaining Contractual Life	103 months
Options Outstanding, Number | shares	14,500
Options Outstanding, Weighted Average Exercise Price	$ 53.82
Options Exercisable, Number | shares	2,900
Options Exercisable, Weighted Average Exercise Price	$ 53.82
109 mo.
Defined Contribution Plan Disclosure [Line Items]
Weighted Average Remaining Contractual Life	109 months
Options Outstanding, Number | shares	7,500
Options Outstanding, Weighted Average Exercise Price	$ 46.59
Options Exercisable, Weighted Average Exercise Price	$ 46.59
116 mo.
Defined Contribution Plan Disclosure [Line Items]
Weighted Average Remaining Contractual Life	116 months
Options Outstanding, Number | shares	36,500
Options Outstanding, Weighted Average Exercise Price	$ 46.94
Options Exercisable, Weighted Average Exercise Price	$ 46.94