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EQUITY PLANS (Details) $ in Millions	12 Months Ended
	Jul. 30, 2016 USD ($) Plan installment shares	Aug. 01, 2015 USD ($)	Aug. 02, 2014 USD ($) shares	Dec. 16, 2015 shares	Dec. 15, 2015 shares	Dec. 16, 2010 shares
Equity plans
Share-based compensation expense | $	$ 15.3	$ 14.0	$ 14.6
Unrecognized compensation cost | $	$ 28.7
Estimated weighted-average period for unrecognized compensation cost (in years)	2 years 6 months 26 days
Stock Incentive Plan 1996
Equity plans
Maximum term of options granted	10 years
Shares authorized for grant under the plans	7,800,000
Stock Incentive Plan 2002
Equity plans
Maximum term of options granted	10 years
Shares authorized for grant under the plans	7,800,000
Equity Incentive Plan 2004
Equity plans
Portion vested on grant	0.3333
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	3,250,000			2,000,000	1,250,000
Number of shares available for grant	2,354,570
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 | $	$ 0.0	$ (1.0)	$ 1.0
Weighted average assumptions
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			22,229
Stock options
Equity plans
Number of stock option plans | Plan	4
Graded vesting period for employees	4 years
Graded vesting period for non-employee directors	6 months
Portion vested on grant	0.3333
Weighted average assumptions
Expected volatility	27.50%	26.20%	28.50%
Dividend yield	0.00%	0.00%	0.00%
Risk free interest rate	1.30%	1.40%	1.20%
Expected term (in years)	4 years	4 years	3 years
Executive-leadership team | New performance-based equity compensation arrangement with performance-based vesting component
Equity plans
Graded vesting period for employees	2 years
Weighted average assumptions
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0

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Portion of the awards that is immediately vested at the date of grant to nonemployees.

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Description of the period of time over which a non-employee director'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).

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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 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 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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