Restructuring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,039	$ 8,540	$ 14,202	$ 10,473
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,782	2,863	9,547	4,796
Asset Write Offs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	170	3,423	267	3,423
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	771	2,254	3,454	2,254
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	316		934
Id Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,161	2,995	7,595	4,720
Workplace Safety [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,878	$ 5,545	$ 6,607	$ 5,753