Major Customers Who Accounted for 10% or More of Net Product and Engineering Revenue (Detail)	3 Months Ended
	Oct. 31, 2013		Oct. 31, 2012
Philips
Concentration Risk [Line Items]
Percentage of net product and engineering revenue	17.00%		17.00%
Siemens Ag
Concentration Risk [Line Items]
Percentage of net product and engineering revenue	10.00%			[1]
Toshiba
Concentration Risk [Line Items]
Percentage of net product and engineering revenue		[1]	11.00%

[1] Total net revenue was less than 10% in this period.