Condensed Consolidating Financial Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 11,016		$ (13,036)	$ (3,116)	$ (57,342)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization				39,432	38,764
Interest expense related to amortization of debt issue costs and debt discount	1,800		6,800	4,999	12,687
Stock-based compensation	400		500	1,267	1,379
Deferred income taxes				223	82
Net gain on disposition of property, plant and equipment				(726)	(635)
Gain on sale of discontinued operations, net of income taxes				(2,158)	(267)
Gain on convertible debt repayments				(35)	(2,350)
Asset impairments and non-cash restructuring costs				0	13,602
Net loss of unconsolidated joint ventures				0	6,069
Decrease (increase) in trade receivables				1,066	(1,190)
Decrease (increase) in inventories				(2,931)	2,983
Decrease in accounts payable and accrued liabilities				(25,748)	(5,658)
Other changes in operating assets and liabilities, net				(4,403)	1,850
Net cash provided by operating activities				7,870	9,974
Cash flows from investing activities:
Payment for acquisition				(43,250)	(900)
Purchase of property, plant and equipment	(7,139)		(6,473)	(21,546)	(18,305)
Proceeds from disposition of property, plant and equipment				855	1,336
Proceeds from sale of discontinued operations				4,813	2,000
Proceeds from sale of interests in joint ventures				0	18,522
Net change in other assets				(1,124)	(974)
Net cash provided by (used in) investing activities				(60,252)	1,679
Cash flows from financing activities:
Net proceeds from issuance of common stock		78,000		77,957	0
Payments on long-term debt				(39,476)	(32,931)
Debt issue costs				0	(1,040)
Employee stock purchases				609	484
Net cash provided by (used in) financing activities				39,090	(33,487)
Net decrease in cash and cash equivalents				(13,292)	(21,834)
Cash and cash equivalents, beginning of period		53,782		53,782	50,810
Cash and cash equivalents, end of period	40,490		28,976	40,490	28,976
Guarantor Subsidiaries
Cash flows from operating activities:
Net income (loss)	22,624		9,693	35,336	3,188
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization				39,222	38,661
Stock-based compensation				588	572
Deferred income taxes				223	82
Net gain on disposition of property, plant and equipment				(726)	(635)
Gain on sale of discontinued operations, net of income taxes				(2,158)	(267)
Asset impairments and non-cash restructuring costs					13,602
Net loss of unconsolidated joint ventures					6,069
Decrease (increase) in trade receivables				1,066	(1,190)
Decrease (increase) in inventories				(2,931)	2,983
Decrease in accounts payable and accrued liabilities				(14,642)	(4,739)
Other changes in operating assets and liabilities, net				(9,694)	(76,675)
Net cash provided by operating activities				46,284	(18,349)
Cash flows from investing activities:
Payment for acquisition				(43,250)	(900)
Purchase of property, plant and equipment				(19,942)	(17,450)
Proceeds from disposition of property, plant and equipment				855	1,336
Proceeds from sale of discontinued operations				4,813	2,000
Proceeds from sale of interests in joint ventures					18,522
Net change in other assets				(1,798)	(2,346)
Net cash provided by (used in) investing activities				(59,322)	1,162
Cash flows from financing activities:
Employee stock purchases				438	349
Net cash provided by (used in) financing activities				438	349
Net decrease in cash and cash equivalents				(12,600)	(16,838)
Cash and cash equivalents, beginning of period		44,111		44,111	36,122
Cash and cash equivalents, end of period	31,511		19,284	31,511	19,284
Parent Company
Cash flows from operating activities:
Net income (loss)	(11,608)		(22,729)	(38,452)	(60,530)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization				210	103
Interest expense related to amortization of debt issue costs and debt discount				4,999	12,687
Stock-based compensation				679	807
Gain on convertible debt repayments				(35)	(2,350)
Decrease in accounts payable and accrued liabilities				(11,106)	(919)
Other changes in operating assets and liabilities, net				5,291	78,525
Net cash provided by operating activities				(38,414)	28,323
Cash flows from investing activities:
Purchase of property, plant and equipment				(1,604)	(855)
Net change in other assets				674	1,372
Net cash provided by (used in) investing activities				(930)	517
Cash flows from financing activities:
Net proceeds from issuance of common stock				77,957
Payments on long-term debt				(39,476)	(32,931)
Debt issue costs					(1,040)
Employee stock purchases				171	135
Net cash provided by (used in) financing activities				38,652	(33,836)
Net decrease in cash and cash equivalents				(692)	(4,996)
Cash and cash equivalents, beginning of period		9,671		9,671	14,688
Cash and cash equivalents, end of period	$ 8,979		$ 9,692	$ 8,979	$ 9,692