v2.4.0.6

Stock-based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended |  | 12 Months Ended
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Jul. 28, 2012 Year | Jul. 30, 2011 | Jul. 31, 2010 | Sep. 23, 2010 2010 Stock Plan | Jul. 28, 2012 2010 Stock Plan | Jul. 28, 2012 Employee Stock Option | Jul. 28, 2012 Employee Stock Option Minimum | Jul. 28, 2012 Employee Stock Option Maximum | Jul. 28, 2012 Restricted Equity Awards | Jul. 28, 2012 Service-based Restricted Equity Awards Year | Jul. 28, 2012 Performance-based Restricted Equity Awards Year | Jul. 28, 2012 Market-based Restricted Equity Awards Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate number of share that may be issued under Stock Incentive Plan |  |  |  | 18,000,000 |  |  |  |  |  |  |  |
Shares available for future grants under stock incentive plan |  |  |  |  | 7,300,000 |  |  |  |  |  |  |
Stock options vesting period |  |  |  |  |  |  | 4 years | 5 years |  | 4 years | 3 years | 3 years
Stock options, maximum period of expiration |  |  |  |  |  | 10 years |  |  |  |  |  |
Total unrecognized compensation costs related to non-vested option | $ 23.8 |  |  |  |  |  |  |  |  | $ 12.6 | $ 9.1 | $ 2.0
Weighted-average recognition period for unrecognized compensation cost related to non-vested stock awards | 2.4 |  |  |  |  |  |  |  |  | 3.1 | 1.4 | 1.5
Total intrinsic value of options exercised | 25.5 | 21.4 | 20.3 |  |  |  |  |  |  |  |  |
Total fair value of options vested | $ 10.3 | $ 8.4 | $ 6.4 |  |  |  |  |  |  |  |  |
Share based award description |  |  |  |  |  |  |  |  | The 2010 Stock Plan also allows for the issuance of shares of restricted stock and restricted stock units ("RSUs"). Any shares of restricted stock or RSUs are counted against the shares available for future grant limit as three shares for every one restricted share or unit granted. In general, if options are cancelled for any reason or expire, the shares covered by such options again become available for grant. If a share of restricted stock or an RSU unit is forfeited for any reason, three shares become available for grant. |  |  |
Number of shares issuable per vesting of one restricted stock or unit |  |  |  |  |  |  |  |  | 3 |  |  |
Number of shares available for grant upon forfeiture of restricted stock or unit |  |  |  |  |  |  |  |  | 3 |  |  |

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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + 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 (a) -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 64, 65 -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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + 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 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. 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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