Summary Of Business And Significant Accounting Policies (Schedule Of Outstanding Foreign Currency Derivative Contracts Related Primarily To Intercompany Receivables And Payables) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Summary Of Business And Significant Accounting Policies [Abstract]
Notional amount of foreign currency derivative contracts	$ 186,336	$ 202,491
Fair value of foreign currency derivative contracts	$ (1,930)	$ (1,324)