Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended		101 Months Ended	110 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2011	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (16,509,974)	$ (545,461)	$ (131,542,282)	$ (148,052,256)
Net (income) loss attributable to noncontrolling interests	697,727	193,099	17,834,490	18,532,217
Net income (loss) attributable to Arrowhead	(15,812,247)	(352,362)	(113,707,792)	(129,520,039)
(Income) loss from discontinued operations	25	(5,292,971)	42,837,974	42,837,999
Realized and unrealized (gain) loss on investments	58,091	138,486	(821,045)	(762,954)
(Gain) loss from sale of subsidiary			(306,344)	(306,344)
(Gain) loss on purchase of Roche Madison	(1,576,107)			(1,576,107)
Loss on disposal of fixed assets	909,761		127,088	1,036,849
Stock issued as gift			298,750	298,750
Stock issued for professional services			442,882	442,882
Stock issued for in-process research and development			13,166,347	13,166,347
Change in value of derivatives	(226,339)	(1,243,156)	(2,894,512)	(3,120,851)
Purchased in-process research and development-Nanoconduction			2,685,208	2,685,208
Stock-based compensation	837,188	1,078,951	12,340,064	13,177,252
Depreciation and amortization	1,301,806	203,041	5,660,311	6,962,117
Amortization (accretion) of note discounts, net	(20,633)	(12,487)	(7,938)	(28,571)
Gain on sale of stock in subsidiary			(2,292,800)	(2,292,800)
Non-cash impairment expense	1,455,775			1,455,775
Equity in income (loss) of unconsolidated affiliates	205,361	96,367	723,253	928,614
Noncontrolling interest	(697,727)	(193,099)	(17,834,490)	(18,532,217)
Changes in operating assets and liabilities:
Receivables	169,150		(62,815)	106,335
Other receivables	1,173,523	(477,770)	(1,604,963)	(431,440)
Prepaid expenses	(152,782)	5,186	(142,568)	(295,350)
Other current assets	(30,286)	18,472	(96,360)	(126,646)
Deposits			(36,795)	(36,795)
Accounts payable	408,263	81,554	206,434	614,697
Accrued expenses	514,117	(91,059)	534,540	1,048,657
Accrued severance and other liabilities	730,771	47,798	247,865	978,636
NET CASH USED IN OPERATING ACTIVITIES OF CONTINUING OPERATIONS	(10,752,290)	(5,993,049)	(60,537,706)	(71,289,996)
CASH FLOWS FROM INVESTING ACTIVITIES OF CONTINUING OPERATIONS:
Purchase of marketable securities-US Treasury Bills			(18,575,915)	(18,575,915)
Purchase of property and equipment	(392,799)	(9,674)	(3,565,599)	(3,958,398)
Purchase of MASA Energy, LLC			(250,000)	(250,000)
Minority equity investment			(2,000,000)	(2,000,000)
Cash paid for interest in Insert			(10,150,000)	(10,150,000)
Cash obtained from interest in Insert			10,529,594	10,529,594
Proceeds from sale of marketable securities-US Treasury Bills			18,888,265	18,888,265
Proceeds from sale of investments	509,009	1,130,307	2,804,600	3,313,609
Proceeds from sale of subsidiaries			359,375	359,375
Proceeds from sale of fixed assets	25,037		142,375	167,412
Payment for patents			(303,440)	(303,440)
Restricted cash			50,773	50,773
Cash transferred in acquisition/divestitures	121,033	(1,700,398)	(1,700,398)	(1,579,365)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES OF CONTINUING OPERATIONS	262,280	(579,765)	(3,770,370)	(3,508,090)
CASH FLOWS FROM FINANCING ACTIVITIES OF CONTINUING OPERATIONS:
Principal payments on capital leases	(143,905)			(143,905)
Proceeds from issuance of Calando debt			2,516,467	2,516,467
Proceeds from sale of stock in subsidiary	8,000	1,719,158	20,894,100	20,902,100
Proceeds from issuance of common stock and warrants, net	5,401,392	57,163	95,294,780	100,696,172
NET CASH PROVIDED BY FINANCING ACTIVITIES OF CONTINUING OPERATIONS	5,265,487	1,776,321	118,705,347	123,970,834
Cash flows from discontinued operations:
Operating cash flows	(225)	2,265,639	(46,003,507)	(46,003,732)
Investing cash flows			790,625	790,625
Financing cash flows			(1,677,000)	(1,677,000)
Net cash provided by (used in) discontinued operations	(225)	2,265,639	(46,889,882)	(46,890,107)
NET INCREASE (DECREASE) IN CASH	(5,224,748)	(2,530,854)	7,507,389	2,282,641
CASH AT BEGINNING OF PERIOD	7,507,389	6,847,162
CASH AT END OF PERIOD	2,282,641	4,316,308	7,507,389	2,282,641
Supplementary disclosures:
Cash paid for interest	34,758	105,000	230,419	265,177
Cash paid for income taxes		$ 742,500	$ 742,500	$ 742,500