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Divestitures and Held for Sale - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Jul. 14, 2017
Mar. 09, 2017
Sep. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Winter Sport Business [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Selling price of business $ 240.0        
Tools [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash consideration on sale of business   $ 1,950.0      
Disposal group, not discontinued operation, gain (loss) on disposal         $ 784.0
Tools [Member] | Net Sales [Member] | Product Concentration [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Concentration percentage         3.40%
Waddington [Member] | Net Sales [Member] | Product Concentration [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Concentration percentage       6.90% 5.50%
Waddington [Member] | Scenario, Forecast [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash consideration on sale of business     $ 2,300.0    
Fire Building Business [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Write down of carrying value of net asset       $ 9.2