Acquisitions - Narrative (Details) - USD ($) $ in Millions		3 Months Ended						8 Months Ended	9 Months Ended
	Jun. 20, 2024	Feb. 28, 2025	Nov. 30, 2024	Aug. 31, 2024	Feb. 29, 2024	Nov. 30, 2023	Aug. 31, 2023	Feb. 28, 2025	Feb. 28, 2025	Feb. 29, 2024	May 31, 2024	Jun. 01, 2023	May 31, 2023
Business Acquisition [Line Items]
Noncontrolling interest, equity, carrying amount												$ 1.6
Additional paid-in capital		$ 605.3			$ 603.0			$ 605.3	$ 605.3	$ 603.0	$ 604.6	$ 0.5
Revenues		335.4			323.7				1,117.2	1,114.8
Net income (loss)		(3.6)	$ 48.8	$ (62.5)	$ (26.5)	$ 76.9	$ (74.2)		(17.3)	$ (23.8)
9 Story Media Group Inc.
Business Acquisition [Line Items]
Percentage of outstanding shares acquired	100.00%
Percentage of interests acquired	25.00%
Revenues								44.2
Net income (loss)								$ 8.3
Acquisition related costs		$ 0.5							$ 2.6
9 Story Media Group Inc. | Intellectual Property and Customer Contracts/Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	10 years
9 Story Media Group Inc. | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	5 years
9 Story Media Group Inc. | Trade Names
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	10 years
9 Story Media Group Inc. | Software Development
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	3 years
Scholastic, Inc. | Make Believe Ideas Limited (MBI)
Business Acquisition [Line Items]
Ownership percentage												100.00%	95.00%