COMMON STOCK (Details 2) (USD $)	12 Months Ended
	Jul. 31, 2012 Y	Jul. 31, 2011 Y	Jul. 31, 2010 Y
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value at grant date (in dollars per share)	$ 14.13	$ 15.78	$ 10.44
Valuation assumptions:
Expected dividend yield	2.00%	1.90%	2.00%
Expected volatility	38.60%	36.80%	35.20%
Expected life (in years)	5	5	5
Risk-free interest rate	0.80%	1.80%	2.20%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value at grant date (in dollars per share)	$ 13.06	$ 11.66	$ 8.28
Valuation assumptions:
Expected dividend yield	1.40%	1.50%	1.90%
Expected volatility	41.50%	31.40%	31.30%
Expected life (in years)	0.5	0.5	0.5
Risk-free interest rate	0.10%	0.10%	0.20%