Change in Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]
Balance at beginning of fiscal year	$ 13.4	$ 10.9
Actual return on plan assets	2.2	1.5
Employer contributions	1.5	1.6
Plan participant contributions	0.2	0.3
Benefits paid	(0.9)	(0.6)
Foreign currency exchange gain	(0.8)	(0.3)
Transfers from other plans	0.1
Balance at end of fiscal year	15.7	13.4
Funded status	(2.4)	(1.1)
Recognized Long-term liability	$ (2.4)	$ (1.1)