Location of Restructuring Charges Comprised on Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Jul. 31, 2014		Jul. 31, 2013		Jul. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 3.8	[1],[2]	$ 2.8	[1],[2]	$ 0.3	[1],[2]
Accrued Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	3.4		2.8
Other long-term liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 0.4

[1] All activity prior to July 31, 2012 relates to the Fiscal Year 2011 Restructuring Plan. In fiscal year 2013, the restructuring charge of $3.5 million, and cash payments of $0.7 million relate to the Fiscal Year 2013 Restructuring Plan, while cash payments of $0.3 million relate to the Fiscal Year 2011 Restructuring Plan.

[2] Activity in fiscal year 2014 pertains to both the Fiscal Year 2014 Restructuring Plan and the 2013 Restructuring Plan. In fiscal year 2014, the restructuring charges of $2.9 million relate to the Fiscal Year 2014 Restructuring Plan, while restructuring charges of $0.6 million and cash payments of ($2.5) million relate to the Fiscal Year 2013 Restructuring Plan.