Aggregate Change in Benefit Obligation and Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Change in benefit obligation
Benefit obligation at beginning of year	$ 20,095	$ 17,159
Service cost	521	644	368
Interest cost	743	728	589
Actuarial (gain) loss	5,291	2,564
Employee contributions	182	296
Amendments	(187)
Benefits and administrative expenses paid	(445)	(260)
Adjustments	310
Effect of curtailment	(371)	(2,258)
Currency translation	187	1,222
Benefit obligation at end of year	26,326	20,095	17,159
Change in plan assets
Fair value of plan assets at beginning of year	16,498	14,151
Actual return on plan assets	5,316	172
Employee contributions	175	296
Employer contributions	844	1,079
Benefits and administrative expenses paid	(445)	(260)
Currency translation	155	1,060
Fair value of plan assets at end of year	22,543	16,498	14,151
Assets	0	0
Current liability		(1)
Noncurrent liability	(3,783)	(3,596)
Net amount recognized in statement of financial position as a noncurrent asset (liability)	$ (3,783)	$ (3,597)