Restructuring - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Restructuring Charges
Restructuring charges	$ 16,821	$ 15,012	$ 26,046
Employee Severance
Restructuring Charges
Restructuring charges	5,465	9,328	18,350
Facility Closing
Restructuring Charges
Restructuring charges	5,209	4,374
Contract Termination
Restructuring Charges
Restructuring charges	1,979	1,043
Asset Write Offs
Restructuring Charges
Restructuring charges	4,168	267	4,125
Identification Solutions
Restructuring Charges
Restructuring charges	12,104	9,013	15,870
Workplace Safety
Restructuring Charges
Restructuring charges	$ 4,717	$ 5,999	$ 10,176