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Share-Based Compensation (Schedule Of Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)
12 Months Ended
Jan. 31, 2012
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested awards outstanding at beginning of year, Shares 1,000
Non-vested awards outstanding at beginning of year, Weighted Average Fair Value $ 36.64
Shares, granted 10,000
Granted, Weighted Average Fair Value $ 20.08
Vested, Shares (334)
Vested, Weighted Average Fair Value $ 36.64
Exercised, Shares   
Exercised, Weighted Average Fair Value   
Forfeited or Cancelled, Shares   
Forfeited or Cancelled, Weighted Average Fair Value   
Non-vested awards outstanding at end of year, Shares 10,666
Non-vested awards outstanding at end of year, Weighted Average Fair Value $ 21.11