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Acquisitions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 2 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
WoodCrafters Home Products, LLC
Jun. 30, 2014
WoodCrafters Home Products, LLC
Jun. 30, 2013
WoodCrafters Home Products, LLC
Customer Relationships
Jun. 30, 2013
WoodCrafters Home Products, LLC
Technology
Jul. 31, 2014
SentrySafe
Sep. 30, 2014
SentrySafe
Business Acquisition [Line Items]                    
Business acquisition purchase price         $ 302.0       $ 118.5  
Net sales 1,097.7 1,045.0 3,073.3 2,847.9   100.0       25.0
Operating income (Loss) 136.4 97.6 337.6 263.9   12.0        
Identifiable intangible assets             $ 75.9 $ 9.6    
Amortizable identifiable intangible assets, estimated useful life             18 years 10 years