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Parent Company Financial Information - Summary Of Condensed Statement Of Operation And Comprehensive Loss Income (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Condensed Income Statements, Captions [Line Items] |  |  |
Net loss | $ (158.3) | $ (119.1) | $ (122.0)
Foreign currency translation, net of tax | 34.2 | (9.3) | (15.1)
Other Comprehensive Income (Loss), Net of Tax | 35.1 | (9.3) | (16.6)
Comprehensive loss attributable to Mirion Technologies (TopCo), Ltd. stockholders | $ (123.2) | $ (128.4) | $ (138.6)
Loss per share—basic and diluted | $ (24.18) | $ (18.45) | $ (19.36)
Weighted average common shares outstanding – basic and diluted | 6.549 | 6.453 | 6.300
MIRION TECHNOLOGIES LTD [Member] | Parent Company [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Equity in net loss of subsidiaries | $ (158.3) | $ (119.1) | $ (122.0)
Net loss | (158.3) | (119.1) | (122.0)
Foreign currency translation, net of tax | 34.2 | (9.3) | (15.1)
Unrecognized actuarial gain (loss) and prior service benefit, net of tax | 0.9 | 0.0 | (1.5)
Other Comprehensive Income (Loss), Net of Tax | 35.1 | (9.3) | (16.6)
Comprehensive loss attributable to Mirion Technologies (TopCo), Ltd. stockholders | $ (123.2) | $ (128.4) | $ (138.6)
Loss per share—basic and diluted | $ (24.18) | $ (18.45) | $ (19.36)
Weighted average common shares outstanding – basic and diluted | 6.549 | 6.453 | 6.300

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