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Goodwill and Other Intangibles (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended 2 Months Ended 3 Months Ended
Feb. 28, 2013
Feb. 28, 2013
Feb. 29, 2012
May 31, 2012
Feb. 08, 2012
Weekly Reader [Member]
Jan. 03, 2012
Learners Publishing [Member]
Feb. 28, 2013
Alternate Valuation Methodology [Member]
Payments to Acquire Businesses, Net of Cash Acquired   $ 0.1 $ 5.3   $ 2.0 $ 3.0  
Business Acquisition, Purchase Price Allocation, Liabilities Assumed         4.8    
Business Acquisition, Purchase Price Allocation, Goodwill Amount         1.4 1.5  
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets         5.4    
Reporting Unit Goodwill 64.0 64.0          
Fair value exceeds Carrying value 20.00% 20.00%          
Fair Value Inputs, Discount Rate 16.00%           18.00%
Fair Value Inputs EBITDA 4.5           3.8
Weighted Average Remaining Useful Lives Of All Amortizable Intangible Assets 7 years            
Impairment Of Amortization Expense       $ 4.9