Goodwill and Other Intangibles (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	May 31, 2012	Nov. 30, 2012	Nov. 30, 2012	Nov. 30, 2011	May 31, 2012 Weekly Reader [Member]	May 31, 2012 Learners Publishing [Member]
Payments to Acquire Businesses, Net of Cash Acquired					$ 2.0	$ 2.8
Business Acquisition, Purchase Price Allocation, Liabilities Assumed					4.8
Business Acquisition, Purchase Price Allocation, Goodwill Amount					1.4	1.3
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets					5.4
Amortization of Intangible Assets			1.3	0.9
Weighted Average Remaining Useful Lives Of All Amortizable Intangible Assets		8 years
Impairment Of Amortization Expense	$ 4.9