Income Taxes and Other Taxes	9 Months Ended
Income Taxes and Other Taxes	Feb. 29, 2020
Income Tax And Non Income Tax Disclosure [Abstract]
Income Taxes and Other Taxes	INCOME TAXES AND OTHER TAXES Income Taxes In calculating the provision for income taxes on an interim basis, the Company uses an estimate of the annual effective tax rate based upon currently known facts and circumstances and applies that rate to its year-to-date earnings or losses. The Company’s effective tax rate is based on expected income and statutory tax rates and takes into consideration permanent differences between financial statement and tax return income applicable to the Company in the various jurisdictions in which the Company operates. The effect of discrete items, such as changes in estimates, changes in enacted tax laws or rates or tax status, and unusual or infrequently occurring events, is recognized in the interim period in which the discrete item occurs. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained or as the result of new judicial interpretations or regulatory or tax law changes. The Company's interim effective tax rate, inclusive of discrete items, was 28.0% for the three month period ended February 29, 2020 and 27.4% for the nine month period ended February 29, 2020. The Company, including its domestic subsidiaries, files a consolidated U.S. income tax return, and also files tax returns in various states and other local jurisdictions. Also, certain subsidiaries of the Company file income tax returns in foreign jurisdictions. The Company is routinely audited by various tax authorities. Non-income Taxes The Company is subject to tax examinations for sales-based taxes. A number of these examinations are ongoing and, in certain cases, have resulted in assessments from taxing authorities. The Company assesses sales tax contingencies for each jurisdiction in which it operates, considering all relevant facts including statutes, regulations, case law and experience. Where a sales tax liability with respect to a jurisdiction is probable and can be reliably estimated for such jurisdiction, the Company has made accruals for these matters which are reflected in the Company’s Condensed Consolidated Financial Statements. These amounts are included in the Financial Statements in Selling, general and administrative expenses. Future developments relating to the foregoing could result in adjustments being made to these accruals. On June 21, 2018, the U.S. Supreme Court issued its opinion in South Dakota v. Wayfair, Inc. et. al., reversing prior precedent, in particular Quill Corp. v. North Dakota (1992), which held that states could not constitutionally require retailers to collect and remit sales or use taxes in respect to mail order or internet sales made to residents of a state in the absence of the retailer having a physical presence in the taxing state. As a result, the Company now has an obligation, at least on a going forward basis, to collect and remit sales and use taxes, primarily in respect to sales made through its school book club channel, as well as certain sales made through its ecommerce internet sites, to residents in states that the Company has not previously remitted sales or use taxes based on its having no physical presence in such states. As of February 29, 2020, the Company’s school book club channel was remitting sales taxes in 44 states and the District of Columbia. Any on-going or future litigation with states relating to sales and use taxes could be impacted favorably or unfavorably by the Court’s decision in future fiscal periods.