Actuarial Assumptions (Detail)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.80%	4.20%	4.90%
Expected return on assets	6.00%	6.00%	6.25%
Salary increase	3.50%	3.50%	3.75%