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Restructuring (Tables)
12 Months Ended
Jul. 31, 2012
Restructuring [Abstract]  
Reconciliation Of Restructuring Reserves
         
Balance at July 31, 2008   $  
Accruals for restructuring during the reporting period     17,755  
Less settlements made during the period     (13,915 )
Balance at July 31, 2009   $ 3,840  
Accruals for restructuring during the reporting period     8,023  
Less settlements made during the period     (7,724 )
Balance at July 31, 2010   $ 4,139  
Accruals for restructuring during the reporting period     759  
Less settlements made during the period     (4,898 )
Balance at July 31, 2011   $  
Schedule Of Restructuring Expense
                     
    Fiscal Year  
    2012   2011   2010  
Gross Margin   $   $ 20   $ 7,488  
Operating expenses         739     2,677  
Total restructuring and asset impairment expenses   $   $ 759   $ 10,165