Costs, Estimated Earnings and Billings on Uncompleted Contracts (Tables)
 3 Months Ended
Apr. 30, 2013
Costs, Estimated Earnings and Billings on Uncompleted Contracts [Abstract]  
Aggregate amounts of costs incurred and earnings accrued on uncompleted contracts compared with billings for contracts
                 
    April 30,     January 31,  
    2013     2013  

Costs incurred on uncompleted contracts

   $ 289,733,000     $ 259,390,000  

Estimated accrued earnings

     59,482,000       48,724,000  
   

 

 

    

 

 

  
      349,215,000       308,114,000  

Less—Billings to date

     409,638,000       380,295,000  
   

 

 

    

 

 

  
    $ 60,423,000     $ 72,181,000  
   

 

 

    

 

 

  

Costs and estimated earnings in excess of billings

   $ 1,062,000     $ 1,178,000  

Billings in excess of costs and estimated earnings

     61,485,000       73,359,000  
   

 

 

    

 

 

  
    $ 60,423,000     $ 72,181,000