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EQUITY PLANS (Details) $ in Millions	12 Months Ended
	Aug. 03, 2019 shares	Jul. 28, 2018 USD ($) Plan installment shares	Jul. 29, 2017 USD ($) shares	Jul. 30, 2016 USD ($)	Dec. 13, 2017 shares	Dec. 16, 2015 shares	Dec. 15, 2015 shares
Equity plans
Share-based compensation expense | $		$ 25.8	$ 25.7	$ 15.3
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $		6.5	10.0	6.1
Unrecognized compensation cost | $		$ 36.0
Estimated weighted-average period for unrecognized compensation cost (in years)		2 years 4 months 2 days
Stock Incentive Plan 2002
Equity plans
Maximum term of options granted		4 years
Shares authorized for grant under the plans | shares		2,800,000
Equity Incentive Plan 2004
Equity plans
Maximum term of options granted		10 years
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 | shares					1,800,000	2,000,000	1,250,000
Number of shares available for grant | shares		2,676,949
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 | $		$ 5.6	$ 9.0	$ 0.0
Weighted average assumptions
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares	75,000	109,100	397,242
Stock options
Equity plans
Number of stock option plans | Plan		3
Weighted average assumptions
Expected volatility				27.50%
Dividend yield				0.00%
Risk free interest rate				1.30%
Expected term (in years)				4 years

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Represents the number of installments in which awards are vested to non-employees.

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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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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the 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 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.

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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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