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Stock-based Payment Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jun. 12, 2020	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Jul. 31, 2020
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of stock options exercised				889,000
Stock Based Compensation (Textual)
Shares available for calculating intrinsic value (in shares)				7,307,484
Deferred compensation arrangement with individual - requisite service period				5 years
Total stock-based compensation		$ 8,865	$ 6,141	$ 17,778	$ 11,674
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights	106.30
Stock price increase threshold [Member]
Stock Based Compensation (Textual)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights	125
Number of days threshold [Member]
Stock Based Compensation (Textual)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights	20
Award Date [Domain]
Stock Based Compensation (Textual)
Nonqualified stock options to purchase of shares, exercise price	$ 85.04
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 25,500		25,500
Award Date [Domain] | Valuation Technique, Option Pricing Model [Member]
Stock Based Compensation (Textual)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value	$ 25.47
Award Date [Domain] | Chief Executive Officer [Member]
Stock Based Compensation (Textual)
Nonqualified stock options to purchase of shares						1,000,000
Total stock-based compensation				$ 7,600
Employee Stock Option | Valuation Technique, Option Pricing Model [Member]
Stock Based Compensation (Textual)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used				Monte Carlo simulation model
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum				0.71%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum				25.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate				0.00%
Employee Stock Option | Valuation Technique, Option Pricing Model [Member] | Minimum
Stock Based Compensation (Textual)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term				7 years 7 months 20 days
Restricted Stock [Member] | Minimum
Stock Based Compensation (Textual)
Award vesting period				2 years
Restricted Stock [Member] | Maximum
Stock Based Compensation (Textual)
Award vesting period				5 years

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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