Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES OF CONTINUING OPERATIONS:
Net loss	$ (58,725,412)	$ (31,703,433)	$ (22,110,723)
Net (gain) loss attributable to non-controlling interests	95,222	560,144	984,795
NET LOSS ATTRIBUTABLE TO ARROWHEAD	(58,630,190)	(31,143,289)	(21,125,928)
(Income) loss from discontinued operations		354	80
Realized and unrealized (gain) loss on investments			58,091
Charge for bad debt allowance			2,497,300
(Gain) loss on purchase of Roche Madison			(1,576,107)
(Gain) loss on disposal of fixed assets	58,878	76,388	1,079,377
Change in value of derivatives	6,033,659	5,300,389	(386,892)
Contingent consideration - Fair Value Adjustments	2,375,658	1,421,652
Stock-based compensation	5,696,173	1,536,271	1,241,404
Depreciation and amortization	1,345,655	1,751,412	1,748,975
Amortization/accretion of note premiums/discounts, net	793,887	128,406	9,390
Gain on debt extinguishment	(84,721)
Non-cash gain in equity investment	(87,197)
Non-cash impairment expense	2,172,387	2,315,721	1,642,775
Equity in income (loss) of unconsolidated affiliates			240,154
Non-controlling interest	(95,222)	(560,144)	(984,795)
Changes in operating assets and liabilities:
Receivables	75,000	(65,625)	162,855
Other receivables	(25,867)	1,080	(938,179)
Prepaid expenses	(15,812)	44,713	(338,531)
Other assets	(13,287)	(1,811)	(30,600)
Accounts payable	1,412,275	321,647	291,876
Accrued expenses	3,478,094	27,920	186,369
Other liabilities	94,257	(187,910)	882,296
NET CASH USED IN OPERATING ACTIVITIES OF CONTINUING OPERATIONS	(35,416,373)	(19,032,826)	(15,340,090)
CASH FLOWS FROM INVESTING ACTIVITIES OF CONTINUING OPERATIONS:
Purchases of property and equipment	(1,717,362)	(296,880)	(479,710)
Proceeds from sale of fixed assets	10,000	89,505	290,312
Purchase of marketable securities	(46,365,528)	(10,732,571)
Proceeds from sale of marketable securities	11,591,120	1,419,079	509,009
Cash transferred in acquisitions/divestitures			121,033
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES OF CONTINUING OPERATIONS	(36,481,770)	(9,520,867)	440,644
CASH FLOWS FROM FINANCING ACTIVITIES OF CONTINUING OPERATIONS:
Principal payments on capital leases	(225,406)	(214,801)	(196,606)
Proceeds from issuance of common stock and preferred stock, net	172,641,671	42,448,826	10,883,992
Proceeds from the exercise of warrants and stock options	12,878,044	2,057,178	74,239
Proceeds from sale of stock in subsidiary			8,000
NET CASH PROVIDED BY FINANCING ACTIVITIES OF CONTINUING OPERATIONS	185,294,309	44,291,203	10,769,625
Cash flows from discontinued operations:
Operating cash flows		(354)	(280)
Investing cash flows	0	0	0
Financing cash flows	0	0	0
Net cash provided by (used in) discontinued operations:		(354)	(280)
NET INCREASE (DECREASE) IN CASH	113,396,166	15,737,156	(4,130,101)
CASH AT BEGINNING OF PERIOD	19,114,444	3,377,288	7,507,389
CASH AT END OF PERIOD	132,510,610	19,114,444	3,377,288
Supplementary disclosures:
Interest paid	$ 25,635	$ 42,044	$ 42,269