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Equity - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2015
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Common Stock        
Equity [Line Items]        
Issuances of stock     $ 154.2 $ 300.7
Common Stock | Courier Corporation        
Equity [Line Items]        
Issuances of stock $ 154.2      
Common Stock | Consolidated Graphics, Inc        
Equity [Line Items]        
Issuances of stock   $ 300.7    
Treasury Stock        
Equity [Line Items]        
Issuances of stock       $ 18.3
Treasury Stock | Esselte Corporation        
Equity [Line Items]        
Issuances of stock   $ 18.3