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Employee Benefits - Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Options Outstanding, Number | 140,500 | 148,000 | 104,000 | 89,500
Options Outstanding, Weighted Average Exercise Price | $ 34.43 | $ 39.63 | $ 36.56 | $ 33.77
Options Exercisable, Number | 65,800 | 63,700 | 44,900 |
Options Exercisable, Weighted Average Exercise Price | $ 38.44 | $ 33.89 | $ 31.92 |
43 mo. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life | 43 months |  |  |
Options Outstanding, Number | 11,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 37.31 |  |  |
Options Exercisable, Number | 11,500 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 37.31 |  |  |
54 mo. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life | 54 months |  |  |
Options Outstanding, Number | 15,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 34.35 |  |  |
Options Exercisable, Number | 15,500 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 34.35 |  |  |
68 mo. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life | 68 months |  |  |
Options Outstanding, Number | 15,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 37.40 |  |  |
Options Exercisable, Number | 12,400 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 37.40 |  |  |
79 mo. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life | 79 months |  |  |
Options Outstanding, Number | 23,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 34.91 |  |  |
Options Exercisable, Number | 13,800 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 34.91 |  |  |
91 mo. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life | 91 months |  |  |
Options Outstanding, Number | 11,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 53.82 |  |  |
Options Exercisable, Number | 4,600 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 53.82 |  |  |
97 mo. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life | 97 months |  |  |
Options Outstanding, Number | 7,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 46.59 |  |  |
Options Exercisable, Number | 1,500 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 46.59 |  |  |
104 mo. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life | 104 months |  |  |
Options Outstanding, Number | 32,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 46.94 |  |  |
Options Exercisable, Number | 6,500 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 46.94 |  |  |
111 mo. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life | 111 months |  |  |
Options Outstanding, Number | 3,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 40.28 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 40.28 |  |  |
115 mo. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Weighted Average Remaining Contractual Life | 115 months |  |  |
Options Outstanding, Number | 20,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 40.82 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 40.82 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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