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Other Financial Data (Details) - Other Financial Data - Balance Sheet - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 31, 2014
Other Financial Data - Balance Sheet [Abstract] |  |
Unredeemed credits issued in conjunction with the Company’s school-based book club and book fair operations (included in other accrued expenses) | $ 9.3 | $ 10.4

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- References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the aggregate amount of liabilities that result from activities that generate operating income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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