Stockholder's Investments - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncumulative Cash Dividend	$ 0.01665
Amount Entitled To Receive Due To Cumulative Preferred Stock Holders	$ 0.835
Outstanding stock options and restricted shares of Class A Nonvoting Common Stock	4,389,117
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 6,605	$ 11,086	$ 8,016
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.	3,004,348
Weighted average exercise price of options exercisable	$ 31.15	$ 31.46	$ 29.69
Tax benefit on options exercised	952	1,964	777
Options outstanding, ending balance, aggregate intrinsic value	1,145
Options outstanding, exercisable, aggregate intrinsic value	1,145
Total intrinsic value of options exercised	2,452	10,728	3,096
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	4,022,854
Allocated Share-based Compensation Expense	5,214	1,736	9,735
Allocated Share-based Compensation Expense, Net of Tax	3,232	1,059	5,939
Reversal of Stock-Based Compensation Expense		7,883
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	5,507
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	3,004,348	3,311,043	3,503,963
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	$ 12,113	$ 20,324	$ 3,864
Service Based Restricted Shares and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based restricted shares outstanding	104,857	5,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 31.02	$ 32.99	$ 0
Shares outstanding, new grants	108,055	5,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	8,198	0
Weighted-average fair value of options granted during the period (USD per share)	$ 30.93	$ 32.99
Service Based Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, Award Vesting Period	3 years
Expiration period of options	10 years
Vesting period of service based stock options	33.33%
Weighted average exercise price (USD per share)	$ 30.98	$ 30.58	$ 27.05
Weighted-average fair value of options granted during the period (USD per share)		$ 9.05	$ 8.42
Performance Based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of options	10 years
Shares outstanding, new grants	0
Service Based Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, Award Vesting Period	3 years
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, Award Vesting Period	2 years
Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, Award Vesting Period	5 years
Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, Award Vesting Period	7 years
Cliff-Vested Restricted Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, Award Vesting Period	3 years

Amount entitled to receive due to cumulative preferred stock holders.

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Noncumulative cash dividend.

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Reversal of Stock-Based Compensation Expense during the period due to failure to meet performance and/or service obligations associated with performance-based options, restricted stock awards, and restricted stock units.

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Percentage of vesting of share-based compensation awards.

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Share based compensation arrangement by share based payment award options expiration period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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 difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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