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Leases (Details Textual) (USD $) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2012 | Jun. 30, 2012 | Apr. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Leases (Textual) [Abstract] |  |  |  |  |
Rental expense | $ 13,000 |  | $ 8,000 | $ 3,990,057 |
Rental expenses include common area maintenance and real estate taxes |  | 13,000 |  |  |
Utilities costs |  | 16,000 |  |  |
Increase in total monthly expenditures |  |  |  | 72,000 |
Facility and equipment rent expense |  |  |  | 345,000 | 141,000
Roche [Member] |  |  |  |  |
Leases (Textual) [Abstract] |  |  |  |  |
Rental expense |  | 22,000 |  |  |
Payments under a capitalized lease |  | $ 21,000 |  |  |

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- Definition Facility and equipment rent expense. + References No definition available. + Details
Name: | arwr_FacilityAndEquipmentRentExpense
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | arwr_LeasesTextualAbstract
Namespace Prefix: | arwr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Other rental expenses. + References No definition available. + Details
Name: | arwr_OtherRentalExpenses
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
Name: | arwr_PaymentsUnderCapitalLease
Namespace Prefix: | arwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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=6880815&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration