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Commitments and Contingencies - Additional Information (Detail) (USD $) | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Other Commitments [Line Items] |  |
Facility and equipment rent expense | $ 171,500 arwr_FacilityAndEquipmentRentExpense | $ 145,000 arwr_FacilityAndEquipmentRentExpense
Provision for recorded liabilities | 0 us-gaap_RetainedEarningsAppropriated |
Future commitments | 43,100,000 us-gaap_PurchaseObligation |
Commitments expected to be incurred in fiscal 2015 | 31,600,000 us-gaap_PurchaseObligationDueInNextTwelveMonths |
Commitments expected to be incurred beyond fiscal 2015 | 11,500,000 us-gaap_PurchaseObligationDueInSecondYear |
Corporate Headquarters In Pasadena |  |
Other Commitments [Line Items] |  |
Rental expense | 23,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = arwr_CorporateHeadquartersInPasadenaMember |
Operating lease expiration date | Sep. 30, 2019 |
Percentage of increase in annual rental cost | 3.00%arwr_PercentageOfIncreaseInAnnualRentalCost / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = arwr_CorporateHeadquartersInPasadenaMember |
Research Facility in Madison |  |
Other Commitments [Line Items] |  |
Rental expense | 25,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = arwr_ResearchFacilityInMadisonMember |
Operating lease expiration date | Feb. 28, 2019 |
Other rental expenses including common area maintenance and real estate taxes | 16,000 arwr_OtherRentalExpenses / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = arwr_ResearchFacilityInMadisonMember |
Utilities costs per month | 15,000 us-gaap_UtilitiesCosts / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = arwr_ResearchFacilityInMadisonMember |
Increase in total monthly expenditures | 75,000 arwr_IncreaseInMonthlyExpenditureDueToUtilitiesCosts / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = arwr_ResearchFacilityInMadisonMember |
Research Facility in Madison | Assets Held under Capital Leases |  |
Other Commitments [Line Items] |  |
Monthly payments under capital lease | $ 19,000 arwr_PaymentsUnderCapitalLease / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = arwr_ResearchFacilityInMadisonMember |

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- Definition Facility and equipment rent expense. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Increase in monthly expenditure due to utilities costs. + References No definition available. + Details
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Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Other rental expenses. + References No definition available. + Details
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Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Payments under capital lease. + References No definition available. + Details
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- Definition Percentage of increase in annual rental cost. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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- Details
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(3)(i)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21332-112643 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(4)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21346-112643 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph a(4) -Article 7 + Details
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- Definition Utilities costs incurred during the reporting period for services, such as water, sewer, gas, electricity and telephone required to operate a building. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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