Restructuring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,834	$ 3,039	$ 13,991	$ 14,202
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	446	1,782	4,939	9,547
Asset Write Offs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,645	170	3,545	267
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	818	771	3,844	3,454
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	925	316	1,663	934
Id Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,536	1,161	9,845	7,595
Workplace Safety [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,298	$ 1,878	$ 4,146	$ 6,607