Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

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FAIR VALUE MEASUREMENTS (Details) (USD $)
In Millions
Jul. 30, 2011
FAIR VALUE MEASUREMENTS [Abstract]  
Cash and cash equivalents fair value $ 421.6
Short-term investments fair value 123.8
Restricted investments fair value 72.7
Fair value of the diesel fuel swaps $ 0.4