2.4.0.8 Html 101 201 1 true 28 0 false 4 false false R1.htm 101 - Document - Document and Entity Information Sheet http://www.exa.com/taxonomy/role/DocumentandEntityInformation Document and Entity Information true false R2.htm 103 - Statement - Consolidated Balance Sheets Sheet http://www.exa.com/taxonomy/role/StatementOfFinancialPositionClassified Consolidated Balance Sheets false false R3.htm 104 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.exa.com/taxonomy/role/StatementOfFinancialPositionClassifiedParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 105 - Statement - Consolidated Statements of Operations and Statements of Comprehensive Income (Loss) Sheet http://www.exa.com/taxonomy/role/StatementOfIncomeAlternative Consolidated Statements of Operations and Statements of Comprehensive Income (Loss) false false R5.htm 106 - Statement - Consolidated Statements of Cash Flows Sheet http://www.exa.com/taxonomy/role/StatementOfCashFlowsIndirect Consolidated Statements of Cash Flows false false R6.htm 107 - Statement - Consolidated Statements of Cash Flows (Parenthetical) Sheet http://www.exa.com/taxonomy/role/StatementOfCashFlowsIndirectParenthetical Consolidated Statements of Cash Flows (Parenthetical) false false R7.htm 108 - Disclosure - Description of Business Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsNatureOfOperations Description of Business false false R8.htm 109 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlock Summary of Significant Accounting Policies false false R9.htm 110 - Disclosure - Computation of Net Income (Loss) Per Share Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock Computation of Net Income (Loss) Per Share false false R10.htm 111 - Disclosure - Property and Equipment, net Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlock Property and Equipment, net false false R11.htm 112 - Disclosure - Accrued Expenses Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsAccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock Accrued Expenses false false R12.htm 113 - Disclosure - Deferred Rent Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsDeferredRentDisclosureTextBlock Deferred Rent false false R13.htm 114 - Disclosure - Fair Value Measurements Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock Fair Value Measurements false false R14.htm 115 - Disclosure - Acquired Intangible Assets Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsIntangibleAssetsDisclosureTextBlock Acquired Intangible Assets false false R15.htm 116 - Disclosure - Debt Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock Debt false false R16.htm 117 - Disclosure - Commitments and Contingencies Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock Commitments and Contingencies false false R17.htm 118 - Disclosure - Stock Based Compensation Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock Stock Based Compensation false false R18.htm 119 - Disclosure - Income Taxes Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock Income Taxes false false R19.htm 120 - Disclosure - Geographic Information Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock Geographic Information false false R20.htm 121 - Disclosure - Stockholder's Equity Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock Stockholder's Equity false false R21.htm 122 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockPolicies Summary of Significant Accounting Policies (Policies) false false R22.htm 123 - Disclosure - Computation of Net Income (Loss) Per Share (Tables) Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables Computation of Net Income (Loss) Per Share (Tables) false false R23.htm 124 - Disclosure - Property and Equipment, net (Tables) Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlockTables Property and Equipment, net (Tables) false false R24.htm 125 - Disclosure - Accrued Expenses (Tables) Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsAccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlockTables Accrued Expenses (Tables) false false R25.htm 126 - Disclosure - Deferred Rent (Tables) Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsDeferredRentDisclosureTextBlockTables Deferred Rent (Tables) false false R26.htm 127 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlockTables Fair Value Measurements (Tables) false false R27.htm 128 - Disclosure - Acquired Intangible Assets (Tables) Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsIntangibleAssetsDisclosureTextBlockTables Acquired Intangible Assets (Tables) false false R28.htm 129 - Disclosure - Stock Based Compensation (Tables) Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables Stock Based Compensation (Tables) false false R29.htm 130 - Disclosure - Geographic Information (Tables) Sheet http://www.exa.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables Geographic Information (Tables) false false R30.htm 131 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation Summary of Significant Accounting Policies - Additional Information (Detail) false false R31.htm 132 - Disclosure - Computation of Net Income (Loss) Per Share - Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureComputationOfNetIncomeLossPerShareCalculationOfBasicAndDilutedNetIncomeLossPerShare Computation of Net Income (Loss) Per Share - Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) false false R32.htm 133 - Disclosure - Computation of Net Income (Loss) Per Share - Equity Instruments Excluded from Diluted Net Income (Loss) Per Common Share (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureComputationOfNetIncomeLossPerShareEquityInstrumentsExcludedFromDilutedNetIncomeLossPerCommonShare Computation of Net Income (Loss) Per Share - Equity Instruments Excluded from Diluted Net Income (Loss) Per Common Share (Detail) false false R33.htm 134 - Disclosure - Property and Equipment, Net - Schedule of Property and Equipment (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosurePropertyAndEquipmentNetScheduleOfPropertyAndEquipment Property and Equipment, Net - Schedule of Property and Equipment (Detail) false false R34.htm 135 - Disclosure - Property and Equipment, Net - Additional Information (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosurePropertyAndEquipmentNetAdditionalInformation Property and Equipment, Net - Additional Information (Detail) false false R35.htm 136 - Disclosure - Accrued Expenses - Accrued Expenses (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureAccruedExpensesAccruedExpenses Accrued Expenses - Accrued Expenses (Detail) false false R36.htm 137 - Disclosure - Deferred Rent - Additional Information (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureDeferredRentAdditionalInformation Deferred Rent - Additional Information (Detail) false false R37.htm 138 - Disclosure - Deferred Rent - Deferred Rent (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureDeferredRentDeferredRent Deferred Rent - Deferred Rent (Detail) false false R38.htm 139 - Disclosure - Fair Value Measurements - Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureFairValueMeasurementsFairValueHierarchyForFinancialAssetsAndLiabilitiesMeasuredAtFairValue Fair Value Measurements - Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value (Detail) false false R39.htm 140 - Disclosure - Acquired Intangible Assets - Carrying Value of Intangible Assets (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureAcquiredIntangibleAssetsCarryingValueOfIntangibleAssets Acquired Intangible Assets - Carrying Value of Intangible Assets (Detail) false false R40.htm 141 - Disclosure - Acquired Intangible Assets - Additional Information (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureAcquiredIntangibleAssetsAdditionalInformation Acquired Intangible Assets - Additional Information (Detail) false false R41.htm 142 - Disclosure - Debt - Additional Information (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureDebtAdditionalInformation Debt - Additional Information (Detail) false false R42.htm 143 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformation Commitments and Contingencies - Additional Information (Detail) false false R43.htm 144 - Disclosure - Stock Based Compensation - Assumptions Used to Calculate Fair Value of Common Stock Options for Employees and Non-Employees (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureStockBasedCompensationAssumptionsUsedToCalculateFairValueOfCommonStockOptionsForEmployeesAndNonEmployees Stock Based Compensation - Assumptions Used to Calculate Fair Value of Common Stock Options for Employees and Non-Employees (Detail) false false R44.htm 145 - Disclosure - Stock Based Compensation - Additional Information (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformation Stock Based Compensation - Additional Information (Detail) false false R45.htm 146 - Disclosure - Stock Based Compensation - Stock-Based Compensation Expense Related to Stock Options Issued by the Company (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureStockBasedCompensationStockBasedCompensationExpenseRelatedToStockOptionsIssuedByTheCompany Stock Based Compensation - Stock-Based Compensation Expense Related to Stock Options Issued by the Company (Detail) false false R46.htm 147 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureIncomeTaxesAdditionalInformation Income Taxes - Additional Information (Detail) false false R47.htm 148 - Disclosure - Geographic Information - Revenue by Geographic Area (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureGeographicInformationRevenueByGeographicArea Geographic Information - Revenue by Geographic Area (Detail) false false R48.htm 149 - Disclosure - Geographic Information - Net Long-Lived Assets by Principal Geographic Areas (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureGeographicInformationNetLongLivedAssetsByPrincipalGeographicAreas Geographic Information - Net Long-Lived Assets by Principal Geographic Areas (Detail) false false R49.htm 150 - Disclosure - Stockholder's Equity - Additional Information (Detail) Sheet http://www.exa.com/taxonomy/role/DisclosureStockholdersEquityAdditionalInformation Stockholder's Equity - Additional Information (Detail) false false All Reports Book All Reports Process Flow-Through: 103 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Oct. 31, 2012' Process Flow-Through: Removing column 'Jan. 31, 2012' Process Flow-Through: 104 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: Removing column 'Aug. 28, 2013' Process Flow-Through: Removing column 'Aug. 27, 2013' Process Flow-Through: 105 - Statement - Consolidated Statements of Operations and Statements of Comprehensive Income (Loss) Process Flow-Through: 106 - Statement - Consolidated Statements of Cash Flows Process Flow-Through: 107 - Statement - Consolidated Statements of Cash Flows (Parenthetical) exa-20131031.xml exa-20131031.xsd exa-20131031_cal.xml exa-20131031_def.xml exa-20131031_lab.xml exa-20131031_pre.xml true true