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FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 | Jul. 31, 2021 | Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Reallocation of goodwill |  |  |  | $ 0 |
Goodwill |  |  | $ 2,491,300,000 | 2,485,600,000 | $ 2,228,900,000
Non-cash impairment charge |  |  | 0 | 0 | 9,100,000
Carrying value of fixed assets |  |  | 131,500,000 | 125,400,000 |
Corporate | Internal Use Software |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Non-cash impairment charge |  | $ 9,100,000 |  |  |
Carrying value of fixed assets |  |  |  |  | 0
M&D |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Reallocation of goodwill |  |  |  | 95,000,000.0 |
Goodwill | $ 502,200,000 |  | 502,200,000 | 502,200,000 | 407,200,000
M&D | Reorganization of Business Segments, From B&I Segment |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Reallocation of goodwill | 95,000,000 |  |  |  |
M&D | Reorganization of Business Segments, From T&M Segment |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill | 407,200,000 |  |  |  |
B&I |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Reallocation of goodwill |  |  |  | (95,000,000.0) |
Goodwill |  |  | $ 1,092,900,000 | $ 1,087,800,000 | $ 1,129,800,000
B&I | Reorganization of Business Segments, From B&I Segment |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Reallocation of goodwill | $ (95,000,000) |  |  |  |

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