CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Revenue:
Light building products									$ 394,324	$ 339,632	$ 314,062
Heavy construction materials									293,000	281,672	253,300
Energy technology									15,252	11,483	20,602
Total revenue	214,985	197,030	140,988	149,573	190,107	175,621	129,632	137,427	702,576	632,787	587,964
Cost of revenue:
Light building products									283,128	241,669	238,377
Heavy construction materials									219,996	210,158	193,006
Energy technology									6,970	5,893	10,648
Total cost of revenue									510,094	457,720	442,031
Gross profit	64,321	58,505	32,411	37,245	56,702	52,358	31,565	34,442	192,482	175,067	145,933
Operating expenses:
Amortization									20,230	20,675	22,359
Research and development									7,330	8,006	6,451
Selling, general and administrative									110,511	109,838	111,358
Restructuring costs							700	1,400	0	2,145	17,930
Total operating expenses									138,071	140,664	158,098
Operating income (loss)									54,411	34,403	(12,165)
Other income (expense):
Net interest expense									(42,566)	(52,678)	(126,252)
Other, net									364	(7,493)	4,314
Total other income (expense), net									(42,202)	(60,171)	(121,938)
Income (loss) from continuing operations before income taxes									12,209	(25,768)	(134,103)
Income tax benefit (provision)									(3,924)	(661)	171
Income (loss) from continuing operations									8,285	(26,429)	(133,932)
Loss from discontinued operations, net of income taxes									(1,148)	(35,819)	(95,989)
Net income (loss)	$ 10,253	$ 11,016	$ (8,260)	$ (5,872)	$ (4,906)	$ (13,036)	$ (20,558)	$ (23,748)	$ 7,137	$ (62,248)	$ (229,921)
Basic and diluted income (loss) per share:
From continuing operations (in dollars per share)									$ 0.12	$ (0.43)	$ (2.21)
From discontinued operations (in dollars per share)									$ (0.02)	$ (0.59)	$ (1.59)
Earnings (loss) per share, basic and diluted, total (in dollars per share)	$ 0.14	$ 0.15	$ (0.11)	$ (0.09)	$ (0.08)	$ (0.21)	$ (0.34)	$ (0.39)	$ 0.10	$ (1.02)	$ (3.80)