3.19.3 html 327 398 1 false 112 0 false 8 false false R1.htm 001 - Document - Document and Entity Information Sheet http://avalonadvancedmaterials.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 002 - Statement - Consolidated Statements of Financial Position Sheet http://avalonadvancedmaterials.com/role/BalanceSheet Consolidated Statements of Financial Position Statements 2 false false R3.htm 003 - Statement - Consolidated Statements of Comprehensive Loss Sheet http://avalonadvancedmaterials.com/role/IncomeStatement Consolidated Statements of Comprehensive Loss Statements 3 false false R4.htm 004 - Statement - Consolidated Statements of Changes in Equity Sheet http://avalonadvancedmaterials.com/role/StockholdersEquity Consolidated Statements of Changes in Equity Statements 4 false false R5.htm 005 - Statement - Consolidated Statements of Cash Flows Sheet http://avalonadvancedmaterials.com/role/CashFlows Consolidated Statements of Cash Flows Statements 5 false false R6.htm 006 - Disclosure - Nature of Operations and Going Concern Uncertainty Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfGoingConcernExplanatoryTextBlock Nature of Operations and Going Concern Uncertainty Notes 6 false false R7.htm 007 - Disclosure - Basis of Presentation Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfBasisOfPreparationOfFinancialStatementsExplanatoryTextBlock Basis of Presentation Notes 7 false false R8.htm 008 - Disclosure - Summary of Significant Accounting Policies Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfSummaryOfSignificantAccountingPoliciesExplanatoryTextBlock Summary of Significant Accounting Policies Notes 8 false false R9.htm 009 - Disclosure - Recent Accounting Pronouncements Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfChangesInAccountingPoliciesExplanatoryTextBlock Recent Accounting Pronouncements Notes 9 false false R10.htm 010 - Disclosure - Cash and Cash Equivalents Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfCashAndCashEquivalentsExplanatoryTextBlock Cash and Cash Equivalents Notes 10 false false R11.htm 011 - Disclosure - Asset Held for Sale Sheet http://avalonadvancedmaterials.com/role/AssetHeldForSale Asset Held for Sale Notes 11 false false R12.htm 012 - Disclosure - Exploration and Evaluation Assets Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfExplorationAndEvaluationAssetsExplanatoryTextBlock Exploration and Evaluation Assets Notes 12 false false R13.htm 013 - Disclosure - Property, Plant and Equipment Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfPropertyPlantAndEquipmentExplanatoryTextBlock Property, Plant and Equipment Notes 13 false false R14.htm 014 - Disclosure - Deferred Flow-Through Share Premium Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfDeferredFlowthroughSharePremiumExplanatoryTextBlock Deferred Flow-Through Share Premium Notes 14 false false R15.htm 015 - Disclosure - Convertible Note Payable Sheet http://avalonadvancedmaterials.com/role/ConvertibleNotePayable Convertible Note Payable Notes 15 false false R16.htm 016 - Disclosure - Convertible Redeemable Preferred Shares Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfConvertibleRedeemablePreferredSharesExplanatoryTextBlock Convertible Redeemable Preferred Shares Notes 16 false false R17.htm 017 - Disclosure - Derivative Liabilities Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfDerivativeFinancialInstrumentsExplanatoryTextBlock Derivative Liabilities Notes 17 false false R18.htm 018 - Disclosure - Site Closure and Reclamation Provision Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfSiteClosureAndReclamationProvisionExplanatoryTextBlock Site Closure and Reclamation Provision Notes 18 false false R19.htm 019 - Disclosure - Share Capital Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfIssuedCapitalExplanatoryTextBlock Share Capital Notes 19 false false R20.htm 020 - Disclosure - Corporate and Administrative Expenses Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfGeneralAndAdministrativeExpenseExplanatoryTextBlock Corporate and Administrative Expenses Notes 20 false false R21.htm 021 - Disclosure - Capital Management Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatoryTextBlock Capital Management Notes 21 false false R22.htm 022 - Disclosure - Related Party Disclosures Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlock Related Party Disclosures Notes 22 false false R23.htm 023 - Disclosure - Financial Instruments Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfFinancialInstrumentsExplanatoryTextBlock Financial Instruments Notes 23 false false R24.htm 024 - Disclosure - Supplemental Cash Flow Information Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlock Supplemental Cash Flow Information Notes 24 false false R25.htm 025 - Disclosure - Income Taxes Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfIncomeTaxExplanatoryTextBlock Income Taxes Notes 25 false false R26.htm 026 - Disclosure - Loss per Share Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfEarningsPerShareExplanatoryTextBlock Loss per Share Notes 26 false false R27.htm 027 - Disclosure - Operating Lease Arrangements Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfLeasesExplanatoryTextBlock Operating Lease Arrangements Notes 27 false false R28.htm 028 - Disclosure - Commitments Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfCommitmentsExplanatoryTextBlock Commitments Notes 28 false false R29.htm 029 - Disclosure - Events After the Reporting Period Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfEventsAfterReportingPeriodExplanatoryTextBlock Events After the Reporting Period Notes 29 false false R30.htm 030 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockPolicies Summary of Significant Accounting Policies (Policies) Policies http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfSummaryOfSignificantAccountingPoliciesExplanatoryTextBlock 30 false false R31.htm 031 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfSummaryOfSignificantAccountingPoliciesExplanatoryTextBlockTables Summary of Significant Accounting Policies (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfSummaryOfSignificantAccountingPoliciesExplanatoryTextBlock 31 false false R32.htm 032 - Disclosure - Cash and Cash Equivalents (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfCashAndCashEquivalentsExplanatoryTextBlockTables Cash and Cash Equivalents (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfCashAndCashEquivalentsExplanatoryTextBlock 32 false false R33.htm 033 - Disclosure - Exploration and Evaluation Assets (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfExplorationAndEvaluationAssetsExplanatoryTextBlockTables Exploration and Evaluation Assets (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfExplorationAndEvaluationAssetsExplanatoryTextBlock 33 false false R34.htm 034 - Disclosure - Property, Plant and Equipment (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfPropertyPlantAndEquipmentExplanatoryTextBlockTables Property, Plant and Equipment (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfPropertyPlantAndEquipmentExplanatoryTextBlock 34 false false R35.htm 035 - Disclosure - Deferred Flow-Through Share Premium (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfDeferredFlowthroughSharePremiumExplanatoryTextBlockTables Deferred Flow-Through Share Premium (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfDeferredFlowthroughSharePremiumExplanatoryTextBlock 35 false false R36.htm 036 - Disclosure - Convertible Note Payable (Tables) Sheet http://avalonadvancedmaterials.com/role/ConvertibleNotePayableTables Convertible Note Payable (Tables) Tables http://avalonadvancedmaterials.com/role/ConvertibleNotePayable 36 false false R37.htm 037 - Disclosure - Convertible Redeemable Preferred Shares (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfConvertibleRedeemablePreferredSharesExplanatoryTextBlockTables Convertible Redeemable Preferred Shares (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfConvertibleRedeemablePreferredSharesExplanatoryTextBlock 37 false false R38.htm 038 - Disclosure - Derivative Liabilities (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfDerivativeFinancialInstrumentsExplanatoryTextBlockTables Derivative Liabilities (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfDerivativeFinancialInstrumentsExplanatoryTextBlock 38 false false R39.htm 039 - Disclosure - Share Capital (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfIssuedCapitalExplanatoryTextBlockTables Share Capital (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfIssuedCapitalExplanatoryTextBlock 39 false false R40.htm 040 - Disclosure - Corporate and Administrative Expenses (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfGeneralAndAdministrativeExpenseExplanatoryTextBlockTables Corporate and Administrative Expenses (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfGeneralAndAdministrativeExpenseExplanatoryTextBlock 40 false false R41.htm 041 - Disclosure - Related Party Disclosures (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlockTables Related Party Disclosures (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlock 41 false false R42.htm 042 - Disclosure - Financial Instruments (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfFinancialInstrumentsExplanatoryTextBlockTables Financial Instruments (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfFinancialInstrumentsExplanatoryTextBlock 42 false false R43.htm 043 - Disclosure - Supplemental Cash Flow Information (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlockTables Supplemental Cash Flow Information (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfCashFlowStatementExplanatoryTextBlock 43 false false R44.htm 044 - Disclosure - Income Taxes (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfIncomeTaxExplanatoryTextBlockTables Income Taxes (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfIncomeTaxExplanatoryTextBlock 44 false false R45.htm 045 - Disclosure - Loss per Share (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfEarningsPerShareExplanatoryTextBlockTables Loss per Share (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfEarningsPerShareExplanatoryTextBlock 45 false false R46.htm 046 - Disclosure - Operating Lease Arrangements (Tables) Sheet http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfLeasesExplanatoryTextBlockTables Operating Lease Arrangements (Tables) Tables http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfLeasesExplanatoryTextBlock 46 false false R47.htm 047 - Disclosure - Nature of Operations and Going Concern Uncertainty (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfGoingConcernExplanatoryDetails Nature of Operations and Going Concern Uncertainty (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfGoingConcernExplanatoryTextBlock 47 false false R48.htm 048 - Disclosure - Recent Accounting Pronouncements (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/RecentAccountingPronouncementsNarrativeDetails Recent Accounting Pronouncements (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfChangesInAccountingPoliciesExplanatoryTextBlock 48 false false R49.htm 049 - Disclosure - Asset Held for Sale (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/AssetHeldForSaleNarrativeDetails Asset Held for Sale (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/AssetHeldForSale 49 false false R50.htm 050 - Disclosure - Exploration and Evaluation Assets (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfExplorationAndEvaluationAssetsExplanatoryDetails Exploration and Evaluation Assets (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfExplorationAndEvaluationAssetsExplanatoryTextBlockTables 50 false false R51.htm 051 - Disclosure - Property, Plant and Equipment (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfPropertyPlantAndEquipmentExplanatoryDetails Property, Plant and Equipment (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfPropertyPlantAndEquipmentExplanatoryTextBlockTables 51 false false R52.htm 052 - Disclosure - Convertible Note Payable (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/ConvertibleNotePayableDetails1 Convertible Note Payable (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/ConvertibleNotePayableTables 52 false false R53.htm 053 - Disclosure - Convertible Redeemable Preferred Shares (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfConvertibleRedeemablePreferredSharesExplanatoryTextBlockDetails Convertible Redeemable Preferred Shares (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfConvertibleRedeemablePreferredSharesExplanatoryTextBlockTables 53 false false R54.htm 054 - Disclosure - Site Closure and Reclamation Provision (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfSiteClosureAndReclamationProvisionExplanatoryTextBlockDetails Site Closure and Reclamation Provision (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfSiteClosureAndReclamationProvisionExplanatoryTextBlock 54 false false R55.htm 055 - Disclosure - Share Capital (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfIssuedCapitalExplanatoryDetails Share Capital (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfIssuedCapitalExplanatoryTextBlockTables 55 false false R56.htm 056 - Disclosure - Corporate and Administrative Expenses (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfGeneralAndAdministrativeExpenseExplanatoryDetails Corporate and Administrative Expenses (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfGeneralAndAdministrativeExpenseExplanatoryTextBlockTables 56 false false R57.htm 057 - Disclosure - Related Party Disclosures (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfRelatedPartyExplanatoryDetails Related Party Disclosures (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTextBlockTables 57 false false R58.htm 058 - Disclosure - Financial Instruments (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfFinancialInstrumentsExplanatoryDetails Financial Instruments (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfFinancialInstrumentsExplanatoryTextBlockTables 58 false false R59.htm 059 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfIncomeTaxExplanatoryDetails Income Taxes (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfIncomeTaxExplanatoryTextBlockTables 59 false false R60.htm 060 - Disclosure - Loss per Share (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfEarningsPerShareExplanatoryDetails Loss per Share (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfEarningsPerShareExplanatoryTextBlockTables 60 false false R61.htm 061 - Disclosure - Commitments (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfCommitmentsExplanatoryDetails Commitments (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfCommitmentsExplanatoryTextBlock 61 false false R62.htm 062 - Disclosure - Events After the Reporting Period (Narrative) (Details) Sheet http://avalonadvancedmaterials.com/role/EventsAfterReportingPeriodNarrativeDetails Events After the Reporting Period (Narrative) (Details) Details http://avalonadvancedmaterials.com/role/NotesToFinancialStatementsDisclosureOfEventsAfterReportingPeriodExplanatoryTextBlock 62 false false R63.htm 063 - Disclosure - Disclosure of detailed information about estimated useful life or depreciation rate (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureOfDetailedInformationAboutEstimatedUsefulLifeOrDepreciationRateDetails Disclosure of detailed information about estimated useful life or depreciation rate (Details) Details 63 false false R64.htm 064 - Disclosure - Disclosure of detailed information about cash and cash equivalents (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutCashAndCashEquivalentsExplanatoryDetails Disclosure of detailed information about cash and cash equivalents (Details) Details 64 false false R65.htm 065 - Disclosure - Disclosure of detailed information about exploration and evaluation assets (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutExplorationAndEvaluationAssetsExplanatoryTableTextBlockDetails Disclosure of detailed information about exploration and evaluation assets (Details) Details 65 false false R66.htm 066 - Disclosure - Disclosure of detailed information about property, plant and equipment (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatoryDetails Disclosure of detailed information about property, plant and equipment (Details) Details 66 false false R67.htm 067 - Disclosure - Disclosure of detailed information about deferred flow-through share premium (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutDeferredFlowthroughSharePremiumExplanatoryTableTextBlockDetails Disclosure of detailed information about deferred flow-through share premium (Details) Details 67 false false R68.htm 068 - Disclosure - Disclosure of detailed information about changes in the convertible note payable (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureOfDetailedInformationAboutChangesInConvertibleNotePayableDetails Disclosure of detailed information about changes in the convertible note payable (Details) Details 68 false false R69.htm 069 - Disclosure - Disclosure of detailed information about convertible redeemable preferred shares (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutConvertibleRedeemablePreferredSharesExplanatoryTableTextBlockDetails Disclosure of detailed information about convertible redeemable preferred shares (Details) Details 69 false false R70.htm 070 - Disclosure - Disclosure of detailed information about derivative liabilities (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutDerivativeLiabilitiesExplanatoryTableTextBlockDetails Disclosure of detailed information about derivative liabilities (Details) Details 70 false false R71.htm 071 - Disclosure - Disclosure of number and weighted average exercise prices of warrants (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfNumberAndWeightedAverageExercisePricesOfWarrantsExplanatoryTableTextBlockDetails Disclosure of number and weighted average exercise prices of warrants (Details) Details 71 false false R72.htm 072 - Disclosure - Disclosure of number and weighted average exercise prices of share options (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatoryDetails Disclosure of number and weighted average exercise prices of share options (Details) Details 72 false false R73.htm 073 - Disclosure - Disclosure of detailed information about options, valuation assumptions (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutOptionsValuationAssumptionsExplanatoryDetails Disclosure of detailed information about options, valuation assumptions (Details) Details 73 false false R74.htm 074 - Disclosure - Disclosure of range of exercise prices of outstanding share options (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatoryDetails Disclosure of range of exercise prices of outstanding share options (Details) Details 74 false false R75.htm 075 - Disclosure - Disclosure of number and weighted average exercise prices of brokers compensation warrants (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfNumberAndWeightedAverageExercisePricesOfBrokersCompensationWarrantsExplanatoryTableTextBlockDetails Disclosure of number and weighted average exercise prices of brokers compensation warrants (Details) Details 75 false false R76.htm 076 - Disclosure - Disclosure of expenses by nature (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfExpensesByNatureExplanatoryDetails Disclosure of expenses by nature (Details) Details 76 false false R77.htm 077 - Disclosure - Disclosure of information about key management personnel (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfInformationAboutKeyManagementPersonnelExplanatoryDetails Disclosure of information about key management personnel (Details) Details 77 false false R78.htm 078 - Disclosure - Disclosure of liquidity risk (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfLiquidityRiskExplanatoryDetails Disclosure of liquidity risk (Details) Details 78 false false R79.htm 079 - Disclosure - Disclosure of detailed information about non cash financing and investing transactions (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutNonCashFinancingAndInvestingTransactionsExplanatoryTableTextBlockDetails Disclosure of detailed information about non cash financing and investing transactions (Details) Details 79 false false R80.htm 080 - Disclosure - Disclosure of detailed information about effective income tax expense recovery (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutEffectiveIncomeTaxExpenseRecoveryExplanatoryDetails Disclosure of detailed information about effective income tax expense recovery (Details) Details 80 false false R81.htm 081 - Disclosure - Disclosure of deferred taxes (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDeferredTaxesExplanatoryDetails Disclosure of deferred taxes (Details) Details 81 false false R82.htm 082 - Disclosure - Disclosure of temporary difference, unused tax losses and unused tax credits (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatoryDetails Disclosure of temporary difference, unused tax losses and unused tax credits (Details) Details 82 false false R83.htm 083 - Disclosure - Disclosure of detailed information about non-capital losses (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutNoncapitalLossesExplanatoryTableTextBlockDetails Disclosure of detailed information about non-capital losses (Details) Details 83 false false R84.htm 084 - Disclosure - Disclosure of detailed information about operating losses (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfDetailedInformationAboutOperatingLossesExplanatoryTableTextBlockDetails Disclosure of detailed information about operating losses (Details) Details 84 false false R85.htm 085 - Disclosure - Disclosure of detailed information about Loss per Share (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureOfDetailedInformationAboutLossPerShareDetails Disclosure of detailed information about Loss per Share (Details) Details 85 false false R86.htm 086 - Disclosure - Disclosure of maturity analysis of operating lease payments (Details) Sheet http://avalonadvancedmaterials.com/role/DisclosureDisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatoryDetails Disclosure of maturity analysis of operating lease payments (Details) Details 86 false false All Reports Book All Reports avl-20190831.xml avl-20190831.xsd avl-20190831_cal.xml avl-20190831_def.xml avl-20190831_lab.xml avl-20190831_pre.xml http://xbrl.sec.gov/dei/2018-01-31 http://xbrl.ifrs.org/taxonomy/2018-03-16/ifrs-full true true