Restructuring - Restructuring Reserve Roll Forward (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Restructuring Cost and Reserve [Line Items]
Beginning balance, July 31, 2014	$ 4,995
Restructuring charges in continuing operations	4,278	6,840
Restructuring Charges in Discontinued Operations	241
Non-cash write-offs	(196)	0
Cash payments	(3,393)
Ending balance, October 31, 2014	5,925
Asset Write Offs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, July 31, 2014	0
Restructuring charges in continuing operations	200
Restructuring Charges in Discontinued Operations	(4)
Non-cash write-offs	(196)
Cash payments	0
Ending balance, October 31, 2014	0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, July 31, 2014	3,389
Restructuring charges in continuing operations	2,588	6,492
Restructuring Charges in Discontinued Operations	0
Non-cash write-offs	0
Cash payments	(2,141)
Ending balance, October 31, 2014	3,836
Other Restructuring Cost [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, July 31, 2014	1,606
Restructuring charges in continuing operations	1,490
Restructuring Charges in Discontinued Operations	245
Non-cash write-offs	0
Cash payments	(1,252)
Ending balance, October 31, 2014	$ 2,089