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Summary Of Significant Accounting Policies (Schedule Of Allowance For Doubtful Accounts) (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 $ 1,015 $ 1,284 $ 1,229
Additions 3,920 2,397 1,791
Deductions (3,321) (2,666) (1,736)
Balance at end of year $ 1,614 $ 1,015 $ 1,284