Authorized common stock that may be issued and sold under sales agreement.

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Maximum offering price under sales agreement.

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Percentage of commission payable on equity offering.

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Securities that may be sold under the agreement.

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Number of restricted stock award and restricted stock units.

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Stock issued during period shares stock options exercised.

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Face amount or stated value per share of common stock.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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Number of share options (or share units) exercised during the current period.

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Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 05, 2018	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017	Dec. 31, 2014	Jan. 14, 2011
Stockholders' Equity (Details) [Line Items]
Common Stock, Par or Stated Value Per Share (in Dollars per share)		$ 0.01	$ 0.01
Percentage of Commission Payable on Equity Offering		3.00%
Maximum Offering Price Under Sales Agreement		$ 20,000			$ 20,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)		238,230	635,624	141,876
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 159	$ 743	$ 10,530
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		955	1,723	14,510
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 117	$ 6,014	$ 1,388
Performance Shares [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Minimum [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years	2 years	2 years
Maximum [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years	3 years	3 years
2011 Plan [Member]
Stockholders' Equity (Details) [Line Items]
Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Units (in Shares)						3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)	2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	5,000,000	1,223,000
2011 Plan [Member] \| Restricted Stock And Restricted Stock Unit Awards [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				4 years
2011 Plan [Member] \| Minimum [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
2011 Plan [Member] \| Maximum [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Common Stock [Member]
Stockholders' Equity (Details) [Line Items]
Authorized Common Stock that may be Issued and Sold Under Sales Agreement			$ 19,200
Securities That May Be Sold Under The Agreement			$ 150,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)		34,719	294,726	141,876
Treasury Stock, Shares, Acquired (in Shares)			340,898
Stock Issued During Period, Shares, Employee Benefit Plan (in Shares)		315,472	37,580	91,541
Payments of Stock Issuance Costs		$ 832	$ 782	$ 724
Common Stock [Member] \| Restricted Stock [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 4	$ 24	$ 44
Treasury Stock [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)			340,898
Treasury Stock, Shares, Acquired (in Shares)			106,911
Treasury Stock, Value			$ 1,014
Stock Issued During Period, Shares, Employee Benefit Plan (in Shares)			(106,911)
Stock Issued During Period, Shares, Treasury Stock Reissued (in Shares)			106,911
Directors And Officers [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)		203,511
Stock Issued During Period Shares Stock Options Exercised1 (in Shares)		23,376
Executive Officer [Member] \| Performance Shares [Member]
Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 225	$ 141