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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
3 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Consolidated Statements Of Comprehensive Income [Abstract]    
Net income $ 43.1 $ 47.5
Other comprehensive income (loss), net of tax:    
Net change in unrealized gains (losses) on available-for-sale investments 0.2 [1] (0.2) [1]
Foreign currency translation adjustment 0.2 (0.2)
Total other comprehensive income (loss) 0.4 (0.4)
Total comprehensive income $ 43.5 $ 47.1
[1] No tax benefits have been provided in any period primarily due to the uncertainty of realization of cumulative capital loss tax benefits.