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SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Cash paid for interest $ 5,550us-gaap_InterestPaid $ 3,514us-gaap_InterestPaid $ 2,420us-gaap_InterestPaid
Cash paid for income taxes 72,723us-gaap_IncomeTaxesPaid 62,631us-gaap_IncomeTaxesPaid 43,470us-gaap_IncomeTaxesPaid
Cash received from income tax refunds (395)us-gaap_ProceedsFromIncomeTaxRefunds (33)us-gaap_ProceedsFromIncomeTaxRefunds (1,555)us-gaap_ProceedsFromIncomeTaxRefunds
Property, plant and equipment acquired through capital lease obligations $ 131hei_NoncashPPEAcquired $ 0hei_NoncashPPEAcquired $ 295hei_NoncashPPEAcquired