Goodwill and Other Intangibles (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended	9 Months Ended		12 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	May 31, 2011	Feb. 29, 2012 Learners Publishing [Member]	Feb. 29, 2012 Weekly Reader [Member]	May 31, 2011 Math Solutions Business [Member]	Nov. 30, 2010 International Entity [Member]
Payments to Acquire Businesses, Net of Cash Acquired	$ 5.3	$ 9.2		$ 2.8	$ 2.0	$ 8.0
Business Acquisition, Purchase Price Allocation, Goodwill Amount				1.3	6.5	1.7	0.2
Business Acquisition, Purchase Price Allocation, Liabilities Assumed					4.5
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets			5.6			5.6
Goodwill, Impairment Loss			3.4
Finite-Lived Intangible Assets, Amortization Expense	$ 1.3	$ 1.0	$ 1.4
Finite-Lived Intangible Assets, Weighted-Average Useful Life	16