Investments (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
Nov. 30, 2011	Nov. 30, 2010	May 31, 2011
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 22.5	$ 22.5	$ 20.4
Other than Temporary Impairment Losses, Investments			3.6
Cost Method Investments	5.5	9.1	5.7
Equity Method Investments	17.0	13.4	14.7
Income (Loss) from Equity Method Investments	1.7	1.1
Childrens Television Programming Holdings [Member]
Equity Method Investment, Ownership Percentage	14.00%
Equity Method Investments	1.3	0.6	1.3
Usborne [Member]
Equity Method Investment, Ownership Percentage	26.20%
Equity Method Investments	$ 15.7	$ 12.8	$ 13.4

This item represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet. The original cost of the investments may differ from the aggregate carrying amount disclosed due to various adjustments such as: (i) dividends received in excess of earnings after the date of investment that are considered a return of investment and therefore recorded as reductions to cost of the investment, or (ii) a series of operating losses of an investee or other factors which may indicate that a decrease in value of the investment has occurred which is other than temporary and accordingly such decrease in value has been recognized.

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-Name Emerging Issues Task Force (EITF)

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-Name FASB Staff Position (FSP)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References+ Details

- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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+ Details

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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+ Details