Earnings Per Common Share (Detail)	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Earnings Per Share Disclosure [Line Items]
Weighted average common shares outstanding for basic earnings per share	53,289,626	53,002,106	53,247,315	52,965,286
Stock options and unvested restricted stock and restricted stock units	63,401	114,283	78,936	110,699
Weighted average common shares outstanding for diluted earnings per share	53,353,027	53,116,389	53,326,251	53,075,985