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Comprehensive (Loss) Income (Tables)
6 Months Ended
Jan. 31, 2012
Comprehensive Income/Stockholders' Investment [Abstract]  
Total comprehensive income
      September 30,       September 30,       September 30,       September 30,  
    Three Months Ended
January 31,
    Six Months Ended
January 31,
 
    2012     2011     2012     2011  
         

Net (loss) income

  $ (89,954   $ 24,199     $ (57,222   $ 50,480  

Unrealized gain (loss) on cash flow hedges

    348       (165     1,679       (890

Amortization of gain on post-retirement medical, dental and vision plan

    (153     (32     515       (95

Foreign currency translation adjustments

    (11,715     (341     (30,833     29,754  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total comprehensive (loss) income

  $ (101,474   $ 23,661     $ (85,861   $ 79,249