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Discontinued Operations Discontinued Operations Summary of Assets and Liabilities (Details) (USD $)
Dec. 31, 2014
Jun. 30, 2014
Discontinued Operations Summary of Assets and Liabilities [Abstract]    
Disposal Group Including Discontinued Operation Allowance for Doubtful Accounts   $ 410,000ava_DisposalGroupIncludingDiscontinuedOperationAllowanceforDoubtfulAccounts
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents 95,932,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents 95,932,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net   32,070,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet
Disposal Group Including Discontinued Operation Investments and Funds Held for Clients   114,598,000ava_DisposalGroupIncludingDiscontinuedOperationInvestmentsandFundsHeldforClients
Disposal Group Including Discontinued Operation Income Tax Receivable   2,548,000ava_DisposalGroupIncludingDiscontinuedOperationIncomeTaxReceivable
Disposal Group, Including Discontinued Operation, Other Assets, Current   8,908,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets
Disposal Group, Including Discontinued Operation, Assets, Current   254,056,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Disposal Group, Including Discontinued Operation, Goodwill (Deprecated 2014-01-31)   71,123,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1
Disposal Group, Including Discontinued Operation, Intangible Assets, Net (Deprecated 2014-01-31)   37,185,000us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent   4,656,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets
Assets of Disposal Group, Including Discontinued Operation, Noncurrent (Deprecated 2014-01-31)   112,964,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent
Disposal Group, Including Discontinued Operation, Assets   367,020,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Disposal Group, Including Discontinued Operation, Accounts Payable   72,453,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable
Disposal Group Including Discontinued Operations Client Fund Obligations   115,333,000ava_DisposalGroupIncludingDiscontinuedOperationsClientFundObligations
Disposal Group Including Discontinued Operations Current Portion of Long-Term Debt   67,000ava_DisposalGroupIncludingDiscontinuedOperationsCurrentPortionofLongTermDebt
Disposal Group, Including Discontinued Operation, Other Liabilities, Current   35,329,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities
Disposal Group, Including Discontinued Operation, Liabilities, Current   223,182,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Liabilities Of Disposal Group Including Discontinued Operation Line of Credit Noncurrent   40,000,000ava_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationLineofCreditNoncurrent
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent   2,117,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities
Disposal Group, Including Discontinued Operation, Liabilities   265,299,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Disposal Group Including Discontinued Operation Accumulated Amortization   $ 42,266,000ava_DisposalGroupIncludingDiscontinuedOperationAccumulatedAmortization