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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) | 3 Months Ended | 6 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Statement of Comprehensive Income [Abstract] |  |  |  |
Income tax on minimum pension liability adjustments | $ (39,500) | $ (75,000.0) | $ (79,000.0) | $ (150,100)

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