Acquisitions (Notes)	12 Months Ended
Acquisitions (Notes)	May 31, 2020
Business Combinations [Abstract]
Acquisitions	ACQUISITIONS Fiscal 2020 In fiscal 2020, the Company acquired a U.S.-based book fair business resulting in the recognition of $1.6 of amortizable intangible assets. The results of operations of this business subsequent to the acquisition are included in the Children's Book Publishing and Distribution segment. Fiscal 2019 Make Believe Ideas Limited Acquisition On March 27, 2019, the Company completed the acquisition of a majority ownership interest in Make Believe Ideas Limited, a UK-based children's book publishing company, by acquiring an additional 46.5% of equity interest in MBI to bring the Company's total ownership interest to 95.0%. Prior to March 27, 2019, the Company accounted for its 48.5% equity interest under the equity method of accounting. In connection with the acquisition, the carrying value of the pre-existing equity-method investment was remeasured to a fair value of $12.1, resulting in the recognition of a gain of $0.1. The fair value was estimated using future operating cash flow projections that were discounted at a rate of 17.0%, which accounted 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. Additionally, a loss of $1.0 was recorded related to the recognition of accumulated foreign currency translation adjustments previously recorded within accumulated other comprehensive income (loss). The founder and chief executive officer of MBI retains a 5.0% noncontrolling ownership interest in MBI. The Company fully consolidated MBI as of the acquisition date, and the 5.0% noncontrolling interest is classified within stockholder's equity. The results of operations subsequent to the acquisition date are included in the Children's Book Publishing and Distribution segment. The Company accounted for the acquisition of the additional ownership interest as a business combination under the acquisition method of accounting. The acquisition date fair value of the consideration for the additional 46.5% interest was $4.6, consisting of $7.6 net cash paid and the elimination of a $3.0 pre-acquisition payable owed to MBI by the Company. As part of the business combination, the Company determined that the fair value of 100% of MBI was $22.3. Estimated fair values were assigned to the assets and liabilities acquired, including inventory, receivables, payables and a trade name. The Company utilized internally-developed discounted cash flow forecasts to determine the estimated fair value of the trade name of $3.9 and has therefore classified this as a Level 3 fair value measurement. As a result of this acquisition, $6.3 of goodwill was assigned to the Company’s Children's Book Publishing and Distribution segment, which is not deductible for tax purposes. Other Acquisitions In fiscal 2019, the Company purchased a U.S.-based book fair business and a UK-based book clubs business resulting in $0.6 of amortizable intangible assets. The results of operations of these businesses subsequent to the acquisitions were included in the Children's Book Publishing and Distribution and International segments, respectively. The transactions in fiscal 2020 and 2019 were not determined to be material individually, or in the aggregate, to the Company's results and, therefore, pro forma financial information is not presented.