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Retirement and Post-Retirement Benefit Plans (Details)
6 Months Ended 12 Months Ended
Apr. 30, 2011
Oct. 31, 2010
HP 401(k) Plan
   
Net pension and post-retirement benefit costs    
Maximum percent 401(k) match to employees (as a percent)   4.00%
Percent of maximum matching contribution during the period (as a percent)   100.00%
Percent of equal 401(k) match to employees effective during the period (as a percent) 100.00%  
Maximum percent 401(k) match to employees effective during the period (as a percent) 4.00%  
EDS 401(k) Plan through Dec 2010
   
Net pension and post-retirement benefit costs    
Maximum percent 401(k) match to employees (as a percent)   4.00%
Percent of maximum matching contribution during the period (as a percent)   100.00%
Percent of equal 401(k) match to employees effective during the period (as a percent) 100.00%  
Maximum percent 401(k) match to employees effective during the period (as a percent) 4.00%