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Fair Value of Analogic Canada Plan Pension Assets by Assets Category (Detail) (USD $)
In Millions, unless otherwise specified
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Fair value of pension assets $ 15.7 $ 13.4 $ 10.9
Mutual Funds
     
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Fair value of pension assets 15.7 [1] 13.4 [1]  
Significant Unobservable Inputs (Level 3)
     
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Fair value of pension assets 15.7 13.4  
Significant Unobservable Inputs (Level 3) | Mutual Funds
     
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Fair value of pension assets $ 15.7 [1] $ 13.4 [1]  
[1] This comprises units of segregated pooled funds with an insurance company. These funds have underlying values primarily derived from mutual funds that have debt and equity securities, which are traded on an active market based on the closing price of each trading day.