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PENSION PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Oct. 30, 2011	Jul. 31, 2011	Oct. 31, 2010	Oct. 30, 2011	Oct. 31, 2010
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 9.4		$ 9.3	$ 18.7	$ 18.5
Interest cost	19.0		18.7	38.0	37.5
Expected return on plan assets	(19.9)		(16.0)	(39.8)	(32.0)
Net amortization	5.8		8.5	11.7	17.0
Pension expense	14.3		20.5	28.6	41.0
Current Year Employer Contributions [Abstract]
Voluntary Contribution to Qualified Pension Plans		$ 100.0
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year, Description				approximately $140.0 million

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The net amoritization of prior service costs (credits) and (gains) losses recognized in net periodic benefit cost.

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Voluntary Contribution to Qualified Pension Plans

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Descriptive information regarding the employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Description may include a range of expected contributions, required minimum contribution, whether the expected contribution is discretionary, and further explanation.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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