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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, 2025 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Employee Benefits |  |  |  |
Options Outstanding, Number | 152,500 | 140,500 | 148,000 | 104,000
Options Outstanding, Weighted Average Exercise Price | $ 42.76 | $ 34.43 | $ 39.63 | $ 36.56
Options Exercisable, Number | 88,500 | 65,800 | 63,700 |
Options Exercisable, Weighted Average Exercise Price | $ 39.51 | $ 38.44 | $ 33.89 |
31 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 31 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 |  |  |
42 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 42 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 |  |  |
56 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 56 months |  |  |
Options Outstanding, Number | 15,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 37.4 |  |  |
Options Exercisable, Number | 15,500 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 37.4 |  |  |
67 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 67 months |  |  |
Options Outstanding, Number | 23,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 34.91 |  |  |
Options Exercisable, Number | 18,400 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 34.91 |  |  |
79 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 79 months |  |  |
Options Outstanding, Number | 11,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 53.82 |  |  |
Options Exercisable, Number | 6,900 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 53.82 |  |  |
85 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 85 months |  |  |
Options Outstanding, Number | 7,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 46.59 |  |  |
Options Exercisable, Number | 3,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 46.59 |  |  |
92 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 92 months |  |  |
Options Outstanding, Number | 32,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 46.94 |  |  |
Options Exercisable, Number | 13,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 46.94 |  |  |
99 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 99 months |  |  |
Options Outstanding, Number | 3,500 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 40.28 |  |  |
Options Exercisable, Number | 700 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 40.28 |  |  |
103 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 103 months |  |  |
Options Outstanding, Number | 20,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 40.82 |  |  |
Options Exercisable, Number | 4,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 40.82 |  |  |
116 mo. |  |  |  |
Employee Benefits |  |  |  |
Weighted Average Remaining Contractual Life | 116 months |  |  |
Options Outstanding, Number | 12,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 60.42 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 60.42 |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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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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