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Acquisitions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Aug. 31, 2013
WVS-Technology
Jul. 05, 2013
WVS-Technology
Jun. 01, 2013
D and C Import-Export Inc.
Sep. 04, 2012
D and C Import-Export Inc.
Business Acquisition [Line Items]        
Business Acquisition, Transaction Costs   $ 1.0   $ 2.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables     0.2  
Inventory included in purchase price 0.7   1.5  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 0.3      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     0.7  
Business Acquisition, Goodwill, Expected Tax Deductible Amount     $ 0.2