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Segment Information - Reconciliation of Reportable Segment Revenues, Other Income and Adjusted EBITDA to Net Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2022
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues              
Revenues         $ 398.8 $ 382.8 $ 325.9
Other Income, net              
Other income, net         1.5 2.8 182.8
Expenses              
Cost of revenues         147.5 137.6 116.5
Selling, general and administrative         170.4 168.3 145.0
Adjusted EBITDA              
All Other Category Adjusted EBITDA         6.2 3.6 0.2
Other Income, net         0.0 0.0 148.6
General corporate and other expenses         (46.8) (42.6) (42.2)
Interest expense, net         (39.3) (35.1) (21.8)
Loss on extinguishment of debt         0.0 (2.3) 0.0
Goodwill impairment charge $ 0.0 $ 0.0 $ 0.0   0.0 0.0 (6.3)
Intangible asset impairment charge         (7.3) 0.0 (1.6)
Depreciation and amortization expense         (28.3) (45.0) (59.5)
Stock-based compensation expense         (5.8) (7.8) (5.8)
Deferred revenue adjustment         0.0 0.0 (0.6)
Other items         (13.5) (10.5) 14.0
Income (loss) before income taxes         7.5 (2.9) 158.0
Connections Segment [Member]              
Revenues              
Revenues         355.1 340.2 282.6
Other Income, net              
Other income, net         1.5 2.8 34.2
Expenses              
Cost of revenues         136.0 127.4 106.9
Selling, general and administrative         78.3 78.8 76.9
Expenses         214.3 206.2 183.8
Adjusted EBITDA              
Segment Adjusted EBITDA         142.3 136.8 133.0
All Other Category [Member]              
Revenues              
Revenues         43.7 42.6 43.3
Expenses              
Cost of revenues         10.8 9.6 9.5
Selling, general and administrative         26.7 29.4 33.6
Adjusted EBITDA              
Goodwill impairment charge       $ (0.3)      
Non-segment Related [Member]              
Other Income, net              
Other income, net         $ 0.0 $ 0.0 $ 148.6