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Summary of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Apr. 30, 2013
Goodwill And Intangible Assets [Abstract]  
Beginning Balance $ 1,976,987
Adjustment 3,025 [1]
Ending Balance $ 1,980,012
[1] Adjustments relate to effects of foreign currency fluctuations and changes in estimates for acquisitions that closed in the prior fiscal year for which the purchase price allocation was still preliminary.