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EQUITY PLANS (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 28, 2018 shares | Jul. 29, 2017 USD ($) Plan installment shares | Jul. 30, 2016 USD ($) | Aug. 01, 2015 USD ($) | Dec. 16, 2015 shares | Dec. 15, 2015 shares | Dec. 16, 2010 shares
Equity plans |  |  |  |  |  |  |
Share-based compensation expense | $ |  | $ 25.7 | $ 15.3 | $ 14.0 |  |  |
Unrecognized compensation cost | $ |  | $ 38.6 |  |  |  |  |
Estimated weighted-average period for unrecognized compensation cost (in years) |  | 2 years 5 months 1 day |  |  |  |  |
Stock Incentive Plan 2002 |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |
Maximum term of options granted |  | 4 years |  |  |  |  |
Shares authorized for grant under the plans |  | 2,800,000 |  |  |  |  |
Equity Incentive Plan 2004 |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |
Maximum term of options granted |  | 10 years |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  | 1,054,267
Number of equal annual installments in which awards are vested for employees (in installments) | installment |  | 4 |  |  |  |  |
Equity Incentive Plan 2012 |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |
Shares authorized for grant under the plans |  |  |  |  | 2,000,000 | 1,250,000 |
Number of shares available for grant |  | 1,389,248 |  |  |  |  |
Number of equal annual installments in which awards are vested for non-employee directors | installment |  | 2 |  |  |  |  |
Performance-based share awards |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |
Share-based compensation expense | $ |  | $ 9.0 | $ 0.0 | $ (1.0) |  |  |
Weighted average assumptions |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 252,290 | 397,242 |  |  |  |  |
Stock options |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |
Number of stock option plans | Plan |  | 3 |  |  |  |  |
Graded vesting period for employees |  | 4 years |  |  |  |  |
Weighted average assumptions |  |  |  |  |  |  |
Expected volatility |  |  | 27.50% | 26.20% |  |  |
Dividend yield |  |  | 0.00% | 0.00% |  |  |
Risk free interest rate |  |  | 1.30% | 1.40% |  |  |
Expected term (in years) |  |  | 4 years | 4 years |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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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