Earnings Per Common Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Earnings Per Share [Abstract]
Weighted-average common shares outstanding for basic earnings per share (in shares)	55,493,622	55,366,241	55,458,238	55,302,203
Unvested restricted stock units (in shares)	155,823	202,426	261,841	259,472
Weighted-average common shares outstanding assuming dilution (in shares)	55,649,445	55,568,667	55,720,079	55,561,675
Antidilutive stock options, unvested restricted stock units outstanding (in shares)	235,552	60,916	132,942	78,862