Interim Financial Statements (Details)	6 Months Ended
	Apr. 30, 2012
Fiscal Period [Line Items]
Fiscal year	52 or 53 week
Number of weeks in current fiscal year (in weeks)	P53W
Minimum [Member]
Fiscal Period [Line Items]
Number of fiscal weeks in a year (in weeks)	P52W
Maximum [Member]
Fiscal Period [Line Items]
Number of fiscal weeks in a year (in weeks)	P53W