Summary of Charges Related to Accrued Restructuring Activities (Detail) - USD ($) $ in Millions		12 Months Ended
		Jul. 31, 2017	Jul. 31, 2016
Restructuring Cost and Reserve [Line Items]
Balance at beginning period	[1],[2]	$ 5.2	$ 0.6
Restructuring Charge	[1],[2]	7.2	9.6
Cash payments	[1],[2]	(7.7)	(5.0)
Non-cash adjustments	[1],[2]	(1.9)
Balance at end period	[1],[2]	2.8	5.2
Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Balance at beginning period	[3]	5.2	0.2
Restructuring Charge	[3]	5.1	9.4
Cash payments	[3]	(7.6)	(4.4)
Balance at end period	[3]	2.7	5.2
Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Balance at beginning period	[4]	0.0	0.4
Restructuring Charge	[4]	0.1
Cash payments	[4]		(0.4)
Balance at end period	[4]	0.1	0.0
Other Restructuring Cost
Restructuring Cost and Reserve [Line Items]
Restructuring Charge	[5]	2.0	0.2
Cash payments	[5]	(0.1)	$ (0.2)
Non-cash adjustments	[5]	$ (1.9)

[1] Activity in fiscal year 2016 pertains to the Fiscal Year 2016 Restructuring Plan, the Fiscal Year 2014 Restructuring Plan and the 2013 Restructuring Plan. In fiscal year 2016, there were restructuring charges of $9.6 million and cash payments of ($4.4) million related to the Fiscal Year 2016 Restructuring Plan, while there were cash payments of ($0.2) million and ($0.4) million related to the Fiscal Year 2014 Restructuring Plan and Fiscal Year 2013 Restructuring Plan, respectively.

[2] Activity in fiscal year 2017 pertains to the Fiscal Year 2017 Restructuring Plan and the Fiscal Year 2016 Restructuring Plan.  In fiscal year 2017, there were restructuring charges of $7.2 million and cash payments of ($2.5) million related to the Fiscal Year 2017 Restructuring Plan, while there were cash payments of ($5.2) million related to the Fiscal Year 2016 Restructuring.

[3] Restructuring charges in fiscal year 2017, include $5.1 million with respect to the Fiscal Year 2017 Restructuring Plan.

[4] Cash payments in fiscal year 2016 pertain only to the closure of the Englewood Colorado facility. In fiscal 2017 there were $0.1 million of restructuring charges associated to the exit of the Charlottesville facility as part of our strategic strategy to reorganize the business cost.

[5] In fiscal year 2017, there were non-cash adjustments of ($1.9) million related to fixed asset write-offs that were incurred due to strategic changes in the Oncura, Sonic Window and Ultrasound portfolio.