Fair Value of Analogic Canada Plan Pension Assets by Assets Category (Detail) - USD ($) $ in Millions		Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets		$ 15.0	$ 15.7	$ 13.4
Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	[1]	15.0	15.7
Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets		15.0	15.7
Quoted Prices in Active Markets (Level 1) | Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	[1]	$ 15.0	$ 15.7

[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.