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Summary Of Significant Accounting Policies (Schedule Of Activity Of Sales Returns Reserve) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
Balance at beginning of year	$ 11,367	$ 9,912	$ 7,547
Additions	41,034	41,692	33,889
Deductions	(41,434)	(40,237)	(31,524)
Balance at end of year	$ 10,967	$ 11,367	$ 9,912