Earnings Per Common Share (Detail)	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Earnings Per Share Disclosure [Line Items]
Weighted average common shares outstanding for basic earnings per share	53,289,864	53,023,277	53,261,186	52,984,192
Stock options and unvested restricted stock and restricted stock units	95,500	91,198	84,458	104,199
Weighted average common shares outstanding for diluted earnings per share	53,385,364	53,114,475	53,345,644	53,088,391