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Correction of Immaterial Errors (Effect of recording immaterial corrections in the condensed consolidated balance sheets and consolidated statements of comprehensive income (loss))(Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 9 Months Ended
Apr. 30, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jul. 31, 2013
Oct. 31, 2013
Jan. 31, 2014
Accrued pension expenses $ 23,538 $ 25,192 $ 25,763 $ 26,074 $ 25,763 $ 25,192 $ 23,951
Total stockholder’s equity 24,205 34,387 29,705 23,117 29,705 34,387 27,605
Net income (loss) (3,855) 3,408 6,210 (4,447)      
Comprehensive income (loss) (3,534) 4,610 6,612 (4,045) 2,567 7,177  
As Previously Reported
              
Accrued pension expenses   26,398 26,567 26,476 26,567 26,398  
Total stockholder’s equity   33,181 28,901 22,715 28,901 33,181  
Net income (loss)   3,408 6,210 (4,447)      
Comprehensive income (loss)   $ 4,208 $ 6,210 $ (4,447) $ 1,763 $ 5,971