Investments (Narrative) (Details)	Oct. 28, 2012
Minimum [Member]
Investment [Line Items]
Investment maturity period	3 months
Temporary Investments [Member] | Maximum [Member]
Investment [Line Items]
Investment maturity period	12 months
Temporary Investments [Member] | Minimum [Member]
Investment [Line Items]
Investment maturity period	3 months
Long-Term Investments [Member] | Minimum [Member]
Investment [Line Items]
Investment maturity period	12 months