Condensed Consolidating Financial Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Total revenue	$ 179,725us-gaap_Revenues	$ 156,512us-gaap_Revenues	$ 379,322us-gaap_Revenues	$ 322,127us-gaap_Revenues
Cost of revenue:
Total cost of revenue	132,584us-gaap_CostOfRevenue	117,961us-gaap_CostOfRevenue	276,494us-gaap_CostOfRevenue	242,683us-gaap_CostOfRevenue
Gross profit	47,141us-gaap_GrossProfit	38,551us-gaap_GrossProfit	102,828us-gaap_GrossProfit	79,444us-gaap_GrossProfit
Operating expenses:
Amortization	4,560us-gaap_AmortizationOfDeferredCharges	5,485us-gaap_AmortizationOfDeferredCharges	9,046us-gaap_AmortizationOfDeferredCharges	10,591us-gaap_AmortizationOfDeferredCharges
Selling, general and administrative	34,351	32,517	66,380	60,744
Total operating expenses	38,911us-gaap_OperatingExpenses	38,002us-gaap_OperatingExpenses	75,426us-gaap_OperatingExpenses	71,335us-gaap_OperatingExpenses
Operating income	8,230us-gaap_OperatingIncomeLoss	549us-gaap_OperatingIncomeLoss	27,402us-gaap_OperatingIncomeLoss	8,109us-gaap_OperatingIncomeLoss
Other income (expense):
Net interest expense	(35,965)us-gaap_InterestIncomeExpenseNet	(12,234)us-gaap_InterestIncomeExpenseNet	(47,917)us-gaap_InterestIncomeExpenseNet	(22,290)us-gaap_InterestIncomeExpenseNet
Other, net	(33)us-gaap_OtherNonoperatingIncomeExpense	(32)us-gaap_OtherNonoperatingIncomeExpense	(302)us-gaap_OtherNonoperatingIncomeExpense	(20)us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense), net	(35,998)us-gaap_NonoperatingIncomeExpense	(12,266)us-gaap_NonoperatingIncomeExpense	(48,219)us-gaap_NonoperatingIncomeExpense	(22,310)us-gaap_NonoperatingIncomeExpense
Loss from continuing operations before income taxes	(27,768)	(11,717)	(20,817)	(14,201)
Income tax benefit (provision)	2,780us-gaap_IncomeTaxExpenseBenefit	2,210us-gaap_IncomeTaxExpenseBenefit	2,980us-gaap_IncomeTaxExpenseBenefit	2,560us-gaap_IncomeTaxExpenseBenefit
Loss from continuing operations	(24,988)	(9,507)	(17,837)	(11,641)
Income (loss) from discontinued operations, net of income taxes	(210)	(575)	(277)	125
Net loss	(25,198)us-gaap_ProfitLoss	(10,082)us-gaap_ProfitLoss	(18,114)us-gaap_ProfitLoss	(11,516)us-gaap_ProfitLoss
Net income attributable to non-controlling interest	(259)	(236)	(504)	(230)
Net loss attributable to Headwaters Incorporated	(25,457)us-gaap_NetIncomeLoss	(10,318)us-gaap_NetIncomeLoss	(18,618)us-gaap_NetIncomeLoss	(11,746)us-gaap_NetIncomeLoss
Building Products
Revenue:
Total revenue	106,406	94,139	223,940	187,151
Cost of revenue:
Total cost of revenue	79,481	70,828	163,673	140,166
Construction Materials
Revenue:
Total revenue	67,498	59,093	148,902	130,614
Cost of revenue:
Total cost of revenue	50,738	45,669	110,249	100,434
Energy Technology
Revenue:
Total revenue	5,821	3,280	6,480	4,362
Cost of revenue:
Total cost of revenue	2,365	1,464	2,572	2,083
Consolidation, Eliminations
Other income (expense):
Equity in earnings of subsidiaries	(12,325)	(3,574)	(34,125)	(15,225)
Total other income (expense), net	(12,325)	(3,574)	(34,125)	(15,225)
Loss from continuing operations before income taxes	(12,325)	(3,574)	(34,125)	(15,225)
Loss from continuing operations	(12,325)	(3,574)	(34,125)	(15,225)
Net loss	(12,325)	(3,574)	(34,125)	(15,225)
Net loss attributable to Headwaters Incorporated	(12,325)	(3,574)	(34,125)	(15,225)
Guarantor Subsidiaries
Revenue:
Total revenue	169,254	147,481	357,710	311,421
Cost of revenue:
Total cost of revenue	125,519	111,591	261,755	234,844
Gross profit	43,735	35,890	95,955	76,577
Operating expenses:
Amortization	4,191	5,123	8,309	10,229
Selling, general and administrative	26,636	25,610	52,438	48,411
Total operating expenses	30,827	30,733	60,747	58,640
Operating income	12,908	5,157	35,208	17,937
Other income (expense):
Net interest expense	(60)	(146)	(104)	(167)
Other, net	(62)	29	(142)	74
Total other income (expense), net	(122)	(117)	(246)	(93)
Loss from continuing operations before income taxes	12,786	5,040	34,962	17,844
Income tax benefit (provision)	(1,300)	(1,571)	(2,570)	(3,350)
Loss from continuing operations	11,486	3,469	32,392	14,494
Income (loss) from discontinued operations, net of income taxes		(575)	(67)	125
Net loss	11,486	2,894	32,325	14,619
Net loss attributable to Headwaters Incorporated	11,486	2,894	32,325	14,619
Guarantor Subsidiaries \| Building Products
Revenue:
Total revenue	95,935	85,108	202,328	176,445
Cost of revenue:
Total cost of revenue	72,416	64,458	148,934	132,327
Guarantor Subsidiaries \| Construction Materials
Revenue:
Total revenue	67,498	59,093	148,902	130,614
Cost of revenue:
Total cost of revenue	50,738	45,669	110,249	100,434
Guarantor Subsidiaries \| Energy Technology
Revenue:
Total revenue	5,821	3,280	6,480	4,362
Cost of revenue:
Total cost of revenue	2,365	1,464	2,572	2,083
Non-Guarantor Subsidiaries
Revenue:
Total revenue	10,471	9,031	21,612	10,706
Cost of revenue:
Total cost of revenue	7,065	6,370	14,739	7,839
Gross profit	3,406	2,661	6,873	2,867
Operating expenses:
Amortization	369	362	737	362
Selling, general and administrative	1,618	1,142	3,192	1,395
Total operating expenses	1,987	1,504	3,929	1,757
Operating income	1,419	1,157	2,944	1,110
Other income (expense):
Other, net	29	(61)	(160)	(94)
Total other income (expense), net	29	(61)	(160)	(94)
Loss from continuing operations before income taxes	1,448	1,096	2,784	1,016
Income tax benefit (provision)	(140)	(180)	(270)	(180)
Loss from continuing operations	1,308	916	2,514	836
Income (loss) from discontinued operations, net of income taxes	(210)		(210)
Net loss	1,098	916	2,304	836
Net income attributable to non-controlling interest	(259)	(236)	(504)	(230)
Net loss attributable to Headwaters Incorporated	839	680	1,800	606
Non-Guarantor Subsidiaries \| Building Products
Revenue:
Total revenue	10,471	9,031	21,612	10,706
Cost of revenue:
Total cost of revenue	7,065	6,370	14,739	7,839
Parent Company
Operating expenses:
Selling, general and administrative	6,097	5,765	10,750	10,938
Total operating expenses	6,097	5,765	10,750	10,938
Operating income	(6,097)	(5,765)	(10,750)	(10,938)
Other income (expense):
Net interest expense	(35,905)	(12,088)	(47,813)	(22,123)
Equity in earnings of subsidiaries	12,325	3,574	34,125	15,225
Total other income (expense), net	(23,580)	(8,514)	(13,688)	(6,898)
Loss from continuing operations before income taxes	(29,677)	(14,279)	(24,438)	(17,836)
Income tax benefit (provision)	4,220	3,961	5,820	6,090
Loss from continuing operations	(25,457)	(10,318)	(18,618)	(11,746)
Net loss	(25,457)	(10,318)	(18,618)	(11,746)
Net loss attributable to Headwaters Incorporated	$ (25,457)	$ (10,318)	$ (18,618)	$ (11,746)

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