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Line Of Credit Facility (Details) (USD $)
 3 Months Ended
Apr. 30, 2012
Y
Line of Credit Facility [Line Items]  
Line of credit facility, extension of term per amendment, number of years 3
Line Of Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Outstanding letters of credit and stand-by letters of credit 73,202,000
Available credit, including accordion feature 101,798,000
Maximum [Member]
  
Line of Credit Facility [Line Items]  
Interest rate on cash advances in addition to LIBOR 1.50%
Maximum [Member] | Amendment [Member]
  
Line of Credit Facility [Line Items]  
Increase in available credit limit 175,000,000
Minimum [Member]
  
Line of Credit Facility [Line Items]  
Interest rate on cash advances in addition to LIBOR 0.50%
Minimum [Member] | Amendment [Member]
  
Line of Credit Facility [Line Items]  
Increase in available credit limit 100,000,000