Acquisitions	12 Months Ended
May 31, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions	ACQUISITIONSOn September 1, 2022, the Company acquired 100% of the share capital of Learning Ovations, Inc., a U.S.-based education technology business and developer of a literacy assessment and instructional system, for $11.1, net of cash acquired. The Company accounted for the acquisition as a business combination under the acquisition method of accounting. Fair values were assigned to the assets and liabilities acquired, including cash, receivables, and technology/know-how. The receivables acquired had a fair value of $0.1 and have been substantially collected as of May 31, 2023. The Company utilized internally-developed discounted cash flow forecasts to determine the fair value of the technology/know-how using a discount rate of 17.5% to account for the relative risks of the estimated future cash flows. The Company classified this as a Level 3 fair value measurement due to the use of these significant unobservable inputs. The fair values of the net assets were $3.6 which included $4.1 of amortizable intangible assets attributable to the technology/know-how and a $0.6 deferred tax liability. This acquisition resulted in $7.6 of goodwill that was assigned to the Company's Education Solutions segment and is not deductible for tax purposes. The results of operations of this business subsequent to the acquisition are included in the Education Solutions segment. The transaction was not determined to be material to the Company's results and therefore pro forma financial information is not presented.There were no acquisitions during fiscal 2022.

Acquisitions

12 Months Ended

May 31, 2023

Business Combination and Asset Acquisition [Abstract]

ACQUISITIONSOn September 1, 2022, the Company acquired 100% of the share capital of Learning Ovations, Inc., a U.S.-based education technology business and developer of a literacy assessment and instructional system, for $11.1, net of cash acquired. The Company accounted for the acquisition as a business combination under the acquisition method of accounting. Fair values were assigned to the assets and liabilities acquired, including cash, receivables, and technology/know-how. The receivables acquired had a fair value of $0.1 and have been substantially collected as of May 31, 2023. The Company utilized internally-developed discounted cash flow forecasts to determine the fair value of the technology/know-how using a discount rate of 17.5% to account for the relative risks of the estimated future cash flows. The Company classified this as a Level 3 fair value measurement due to the use of these significant unobservable inputs. The fair values of the net assets were $3.6 which included $4.1 of amortizable intangible assets attributable to the technology/know-how and a $0.6 deferred tax liability. This acquisition resulted in $7.6 of goodwill that was assigned to the Company's Education Solutions segment and is not deductible for tax purposes. The results of operations of this business subsequent to the acquisition are included in the Education Solutions segment. The transaction was not determined to be material to the Company's results and therefore pro forma financial information is not presented.There were no acquisitions during fiscal 2022.