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Composition of Certain Financial Statement Captions - Narratives (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Composition Of Certain Financial Statement Captions [Abstract] |  |  |
Net periodic post-retirement benefit cost | $ 0.7 | $ 1.3 | $ 1.3

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- Definition Composition of certain financial statement captions. + References No definition available. + Details
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