Income Taxes and Other Taxes	9 Months Ended
Feb. 28, 2018
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 the facts and circumstances known 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 annual effective tax rate, exclusive of discrete items, is expected to be approximately 33.9%. The interim effective tax rate, inclusive of discrete items, was 22.3% and 23.8% for the three and nine month periods ended February 28, 2018, respectively. On December 22, 2017, the Tax Cuts and Jobs Act (the "Act") was signed into law resulting in a significant change in the framework for U.S. corporate taxes. The Act reduces the U.S. federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and creates new taxes on certain foreign sourced earnings. As a result, the Company's income tax benefit for each of the three and nine month periods ended February 28, 2018 includes expense related to the re-measurement of the Company's U.S. deferred tax balances of $8.3, based upon the Company's estimate of the amount and timing of future income taxes and related deductions. The Company does not expect to incur a one-time transition tax on earnings of foreign subsidiaries. The re-measurement of the Company's U.S. deferred tax balances, any transition tax and interpretation of the new law is provisional subject to clarifications of the new legislation and final calculations. Any future changes to the Company’s provisional estimates, related to Act, will be reflected as a change in estimate in the period in which the change in estimate is made in accordance with Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act ("SAB 118"). SAB 118 allows for a measurement period of up to one year after the enactment date of the Act to finalize the recording of the related tax impacts. The Act also subjects a U.S. shareholder to tax on global intangible low-taxed income ("GILTI") earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. The Company is still evaluating the effects of the GILTI provisions and has not yet determined an accounting policy or a reasonable estimate of a potential impact (if any). The Company has not reflected any adjustments related to GILTI in the financial statements. 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. When a sales tax liability with respect to a particular 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 in Selling, general and administrative expenses. Future developments relating to the foregoing could result in adjustments being made to these accruals. The State of Wisconsin has assessed Scholastic Book Fairs, Inc. (“SBF”), a wholly owned subsidiary of the Company, $5.4, exclusive of penalties and interest, for sales tax in fiscal years 2004 through 2014. Based upon the facts and circumstances and the relevant laws in the State of Wisconsin, the Company does not believe these assessments are merited and has elected to litigate these assessments. While the Company believes it will prevail in this litigation and accordingly has not recognized a liability for these assessments, the results of litigation cannot be assured and it is reasonably possible that SBF could be found liable for all or a portion of the amounts assessed.

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 the facts and circumstances known 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 annual effective tax rate, exclusive of discrete items, is expected to be approximately 33.9%. The interim effective tax rate, inclusive of discrete items, was 22.3% and 23.8% for the three and nine month periods ended February 28, 2018, respectively. On December 22, 2017, the Tax Cuts and Jobs Act (the "Act") was signed into law resulting in a significant change in the framework for U.S. corporate taxes. The Act reduces the U.S. federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and creates new taxes on certain foreign sourced earnings. As a result, the Company's income tax benefit for each of the three and nine month periods ended February 28, 2018 includes expense related to the re-measurement of the Company's U.S. deferred tax balances of $8.3, based upon the Company's estimate of the amount and timing of future income taxes and related deductions. The Company does not expect to incur a one-time transition tax on earnings of foreign subsidiaries.

The re-measurement of the Company's U.S. deferred tax balances, any transition tax and interpretation of the new law is provisional subject to clarifications of the new legislation and final calculations. Any future changes to the Company’s provisional estimates, related to Act, will be reflected as a change in estimate in the period in which the change in estimate is made in accordance with Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act ("SAB 118"). SAB 118 allows for a measurement period of up to one year after the enactment date of the Act to finalize the recording of the related tax impacts.

The Act also subjects a U.S. shareholder to tax on global intangible low-taxed income ("GILTI") earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. The Company is still evaluating the effects of the GILTI provisions and has not yet determined an accounting policy or a reasonable estimate of a potential impact (if any). The Company has not reflected any adjustments related to GILTI in the financial statements.

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. When a sales tax liability with respect to a particular 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 in Selling, general and administrative expenses. Future developments relating to the foregoing could result in adjustments being made to these accruals.

The State of Wisconsin has assessed Scholastic Book Fairs, Inc. (“SBF”), a wholly owned subsidiary of the Company, $5.4, exclusive of penalties and interest, for sales tax in fiscal years 2004 through 2014. Based upon the facts and circumstances and the relevant laws in the State of Wisconsin, the Company does not believe these assessments are merited and has elected to litigate these assessments. While the Company believes it will prevail in this litigation and accordingly has not recognized a liability for these assessments, the results of litigation cannot be assured and it is reasonably possible that SBF could be found liable for all or a portion of the amounts assessed.