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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended | 1 Months Ended
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Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2013 Cashless Exercise | Jul. 31, 2013 Minimum | Jul. 31, 2013 Maximum | Jul. 31, 2013 2010 Equity and Incentive Plan | Jul. 31, 2013 2006 Equity Incentive Plan | Jul. 31, 2013 Stock Option Awards | Jul. 31, 2012 Stock Option Awards | Jul. 31, 2011 Stock Option Awards | Jul. 31, 2013 Restricted Stock Awards | Jul. 31, 2012 Restricted Stock Awards | Jul. 31, 2011 Restricted Stock Awards | Jul. 31, 2013 Restricted Stock Units (RSUs) | Aug. 31, 2011 August 2011 Repurchase Agreement | Jan. 20, 2012 January 2012 Repurchase Agreement | Jan. 18, 2012 January 2012 Repurchase Agreement | Jan. 20, 2012 Catterton Repurchase Agreements | Jan. 18, 2012 Catterton Repurchase Agreements
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock purchased, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  | 1,000,000 |
Common stock price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.00 | $ 28.50 |  | $ 28.50 |
Aggregate purchase price of common stock |  | $ 77,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 | $ 28,500 |  | $ 28,500 |
Closing price of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.62 |  | $ 29.34 |  | $ 29.34
Percentage of issued and outstanding common stock prior to repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.80% | 1.80% |  | 1.80% |
Number of shares authorized under stock option plan |  |  |  |  |  |  | 2,000,000 | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available to be granted |  |  |  |  |  |  | 1,850,461 | 30,000 |  |  |  |  |  |  |  |  |  |  |  |
Option expiration from the date of grant, in years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option vesting period |  |  |  |  | 3 years | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Weighted average remaining contractual life of outstanding options, years | 4 years 9 months 11 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of exercisable options, years | 4 years 9 months 11 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value of options granted |  |  | $ 10.80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted during the period | 0 | 0 | 130,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation expenses |  |  |  |  |  |  |  |  | 393 | 645 | 2,707 | 133 | 43 | 0 | 2,290 |  |  |  |  |
Unrecognized compensation costs |  |  |  |  |  |  |  |  | 0 |  |  | 405 |  |  |  |  |  |  |  |
Cash received from stock option exercises | 5,845 | 1,428 | 1,047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of stock options exercised | 7,502 | 931 | 1,551 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits from stock compensation expense | 144 | 224 | 1,172 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option exercised | 498,412 | 80,500 | 78,500 | 314,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option value exercised | 14,267 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issued during period |  |  |  | 63,464 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax withholding paid on behalf Of employees | 2,009 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average recognition period for compensation expenses, years |  |  |  |  |  |  |  |  |  |  |  | 3 years 11 months 12 days |  |  |  |  |  |  |  |
Non-cash compensation expense | $ 2,816 | $ 688 | $ 2,707 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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