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Other Financial Data (Details) - Other Financial Data - Balance Sheet - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
May 31, 2016 | May 31, 2015 | May 31, 2014 | May 31, 2013
Other Financial Data - Balance Sheet [Abstract] |  |  |  |
Prepublication and production costs | $ 42.0 | $ 51.7 |  |
Unredeemed credits issued in conjunction with the Company’s school-based book club and book fair operations (included in other accrued expenses) | 8.9 | 9.3 |  |
Reserve For Return [Member] |  |  |  |
Other Financial Data - Balance Sheet [Abstract] |  |  |  |
Accounts receivable reserve for returns | $ 32.1 | $ 27.9 | $ 27.0 | $ 26.0

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