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Stock-Based Compensation - Stock Option Activity, Related to Incentive Plan (Detail) - Jul. 31, 2015 - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Total
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares, beginning balance	17
Exercised, Number of Shares	(6)
Outstanding, Number of Shares, ending balance	11
Exercisable, Number of Shares	9
Outstanding, Weighted-Average Exercise Price, beginning balance	$ 17.22
Exercised, Weighted-Average Exercise Price	16.00
Outstanding, Weighted-Average Exercise Price, ending balance	17.94
Exercisable, Weighted-Average Exercise Price	$ 19.28
Outstanding, Aggregate Intrinsic Value	$ 601
Exercisable, Aggregate Intrinsic Value	$ 491
Weighted-average remaining life of stock options	3 years 3 months 18 days
Exercisable stock options, weighted-average remaining contractual term	2 years 10 months 24 days
2011 Management Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares, beginning balance	20
Exercised, Number of Shares	(6)
Outstanding, Number of Shares, ending balance	14
Exercisable, Number of Shares	4
Outstanding, Weighted-Average Exercise Price, beginning balance	$ 22.64
Exercised, Weighted-Average Exercise Price	21.80
Outstanding, Weighted-Average Exercise Price, ending balance	23.00
Exercisable, Weighted-Average Exercise Price	$ 23.48
Outstanding, Aggregate Intrinsic Value	$ 443
Exercisable, Aggregate Intrinsic Value	$ 125
Weighted-average remaining life of stock options	5 years 7 months 6 days
Exercisable stock options, weighted-average remaining contractual term	4 years

X

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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