text: As of the fiscal year ended January 31, 2015, based on the payout scenario we believe is probable, we estimated the grant date fair value of 
  $10 per unit using the Black-Scholes valuation model. Stock-based compensation expense will be recognized on an accelerated basis due to 
  the performance criteria and graded vesting features of the VCP. In 2014, we recognized $3 in stock-based compensation expense 
  associated with the VCP. 
  
  As of January 31, 2015, we have granted 0.8 of the 1.0 units available for grant. Total unrecognized stock-based compensation expense 
  related to nonvested VCP units was $6, which we expect to recognize over the next 43 months. 
  
  **Performance Share Units**
  We generally grant performance share units to executive officers as one of the ways to align compensation with shareholder interests. 
  Performance share units are earned after a three-year performance cycle only when our total shareholder return (reflecting daily stock price 
  appreciation and compounded reinvestment of dividends) outperforms companies in a defined group of competitors determined by the 
  Compensation Committee of our Board of Directors. Performance share units granted in 2012 and 2013 also require the total shareholder 
  return to be positive for any payout. The percentage of units that are earned depends on our relative position at the end of the performance 
  cycle and can range from 0% to 175% of the number of units granted. 