Earnings Per Common Share (Detail) - shares	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Earnings Per Share [Abstract]
Weighted-average common shares outstanding for basic earnings per share (in shares)	55,366,241	55,198,756	55,323,080	55,163,943
Unvested restricted stock units (in shares)	357,137	194,226	292,027	173,722
Weighted-average common shares outstanding assuming dilution (in shares)	55,723,378	55,392,982	55,615,107	55,337,665
Antidilutive stock options, unvested restricted stock units outstanding (in shares)	86,946	140,481	81,557	189,090