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SHORT-TERM DEBT Credit Facility (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Apr. 30, 2015
Line of Credit  
Line of Credit Facility  
Line of Credit Facility, Initiation Date Sep. 15, 2014
Short-term Debt, Terms (in years) five
Line of Credit Facility, Maximum Borrowing Capacity $ 400us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
Line of Credit Facility, Expiration Date Sep. 15, 2019
Line of Credit Facility, Amount Outstanding 0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
Dako  
Line of Credit Facility  
Line of Credit Facility, Maximum Borrowing Capacity 8us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_BusinessAcquisitionAxis
= a_DakoMember
Line of Credit Facility, Amount Outstanding $ 0us-gaap_LineOfCredit
/ us-gaap_BusinessAcquisitionAxis
= a_DakoMember