Other Financial Data (Details) - Other Financial Data - Balance Sheet (USD $) In Millions, unless otherwise specified	12 Months Ended
May 31, 2013	May 31, 2012
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)	$ 9.5	$ 9.2

The increase (decrease) during the reporting period in the aggregate amount of liabilities that result from activities that generate operating income.

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=31042434&loc=d3e3602-108585

Name:	us-gaap_IncreaseDecreaseInOperatingLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration