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Acquisitions - Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 20, 2024 | Jun. 01, 2023 | May 31, 2026 | May 31, 2025 | May 31, 2024 | May 31, 2023
Business Combination [Line Items] |  |  |  |  |  |
Additional paid-in capital |  |  | $ 602.5 | $ 607.1 |  |
Revenues |  |  | 1,581.9 | 1,625.5 | $ 1,589.7 |
Payments to acquire businesses, net of cash acquired |  |  | 0.0 | 176.2 | 6.4 |
Goodwill |  |  | 199.4 | 198.9 | 132.8 |
Payments to Acquire Additional Interest in Subsidiaries |  |  | 0.0 | 0.0 | $ 2.1 |
Education |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 75.7 | $ 75.7 |  |
9 Story Media Group Inc. |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Percentage of outstanding shares acquired | 100.00% |  |  |  |  |
Percentage of interests acquired | 25.00% |  |  |  |  |
Accounts receivable | $ 14.8 |  |  |  |  |
Net assets acquired | 129.5 |  |  |  |  |
Goodwill | 64.2 |  |  |  |  |
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill | $ 193.7 |  |  |  |  |
9 Story Media Group Inc. | Intellectual Property and Customer Contracts/Relationships |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 10 years |  |  |  |  |
9 Story Media Group Inc. | Customer Relationships |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 5 years |  |  |  |  |
Other Intangible assets: | $ 51.5 |  |  |  |  |
9 Story Media Group Inc. | Trade Names |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 10 years |  |  |  |  |
Other Intangible assets: | $ 16.5 |  |  |  |  |
9 Story Media Group Inc. | Software Development |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 3 years |  |  |  |  |
Other Intangible assets: | $ 1.3 |  |  |  |  |
Make Believe Ideas Limited (MBI) |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Noncontrolling interest, equity, carrying amount |  | $ 1.6 |  |  |  |
Adjustments to additional paid in capital |  | 0.5 |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries |  | $ 2.1 |  |  |  |
Scholastic, Inc. | Make Believe Ideas Limited (MBI) |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  | 100.00% |  |  |  | 95.00%

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