Stockholder's Investments - Summary of Activity under Company's Share-Based Compensation Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Beginning Balance, Price Lower Range	$ 19.96
Options Outstanding, Beginning Balance, Price Upper Range	54.05
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Price	19.96
Options Cancelled, Price Upper Range	39.92
Options Outstanding, Ending Balance, Price Lower Range	19.96	$ 19.96
Options Outstanding, Ending Balance, Price Upper Range	54.05	$ 54.05
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Market Value Of Underlying Stock at Grant Date	49.79
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Price	46.70
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	43.98
Options Cancelled, Price Lower Range	$ 54.05
Options, Outstanding [Roll Forward]
Shares Outstanding, Beginning Balance	1,474,068
Options Granted	302,225
Options Exercised	(141,748)
Options Cancelled	(43,020)
Shares Outstanding, Ending Balance	1,591,525	1,474,068
Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options Outstanding, Beginning Balance, Weighted Average Exercise Price	$ 38.45
Options Granted, Weighted Average Exercise Price	49.17	$ 39.92	$ 54.05
Options Exercised, Weighted Average Exercise Price	23.68
Options Cancelled, Weighted Average Exercise Price	47.09
Options Outstanding, Ending Balance, Weighted Average Exercise Price	$ 41.57	$ 38.45
Options Outstanding, Range of Exercise Prices [Abstract]
Exercise Price Range, Number of Outstanding Options	1,591,525
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term	6 years 4 months 24 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 41.57
Exercise Price Range, Number of Exercisable Options	1,050,240
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term	5 years 3 months 18 days
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 38.90
$19.96 - $26.99 [Member]
Options Outstanding, Range of Exercise Prices [Abstract]
Exercise Price Range, Number of Outstanding Options	106,913
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term	2 years 9 months 18 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 21.10
Exercise Price Range, Number of Exercisable Options	106,913
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term	2 years 9 months 18 days
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 21.10
$27.00 - $32.99 [Member]
Options Outstanding, Range of Exercise Prices [Abstract]
Exercise Price Range, Number of Outstanding Options	749,131
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term	5 years 8 months 12 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 37.12
Exercise Price Range, Number of Exercisable Options	568,451
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term	4 years 10 months 24 days
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 36.23
$33.00 - $43.98 [Member]
Options Outstanding, Range of Exercise Prices [Abstract]
Exercise Price Range, Number of Outstanding Options	735,481
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term	7 years 8 months 12 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 49.07
Exercise Price Range, Number of Exercisable Options	374,876
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term	6 years 7 months 6 days
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 48.02
Service Based Restricted Shares and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 7,767	$ 6,167	$ 9,776
Restricted Shares and RSUs, Nonvested, Number of Shares [Roll Forward]
Restricted Shares and RSUs, Nonvested, Number	156,466
Restricted Shares and RSUs, Grants in Period	99,278
Restricted Shares and RSUs, Vested in Period	(73,162)
Restricted Shares and RSUs, Forfeited in Period	(9,352)
Restricted Shares and RSUs, Nonvested, Number	173,230	156,466
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value	$ 45.40
Restricted Shares and RSUs, Grants in Period, Weighted Average Grant Date Fair Value	48.96	$ 40.82	$ 53.38
Restricted Shares and RSUs, Vested in Period, Weighted Average Grant Date Fair Value	45.47
Restricted Shares and RSUs, Forfeitures, Weighted Average Grant Date Fair Value	44.73
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value	$ 47.45	$ 45.40
Performance Based Restricted Shares and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested	$ 11,435	$ 16,849	$ 14,013
Restricted Shares and RSUs, Nonvested, Number of Shares [Roll Forward]
Restricted Shares and RSUs, Nonvested, Number	119,281
Restricted Shares and RSUs, Grants in Period	76,743
Restricted Shares and RSUs, Vested in Period	(76,885)
Restricted Shares and RSUs, Forfeited in Period	(40,005)
Restricted Shares and RSUs, Nonvested, Number	79,134	119,281
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value	$ 61.05
Restricted Shares and RSUs, Grants in Period, Weighted Average Grant Date Fair Value	61.76	$ 60.73	$ 75.00
Restricted Shares and RSUs, Vested in Period, Weighted Average Grant Date Fair Value	50.70
Restricted Shares and RSUs, Forfeitures, Weighted Average Grant Date Fair Value	62.00
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value	$ 66.79	$ 61.05