Condensed Consolidating Financial Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net loss	$ (5,872)	$ (23,748)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	12,436	13,182
Interest expense related to amortization of debt issue costs and debt discount	1,219	3,049
Stock-based compensation	384	624
Net gain on disposition of property, plant and equipment	(261)	(123)
Gain on convertible debt repayment	0	(2,025)
Non-cash restructuring costs	0	646
Net loss of unconsolidated joint ventures	0	6,069
Decrease in trade receivables	32,164	30,606
Increase in inventories	(461)	(283)
Decrease in accounts payable and accrued liabilities	(36,123)	(21,972)
Other changes in operating assets and liabilities, net	(7,732)	(3,161)
Net cash provided by (used in) operating activities	(4,246)	2,864
Cash flows from investing activities:
Payment for acquisition	(42,950)	0
Purchase of property, plant and equipment	(6,553)	(6,619)
Proceeds from disposition of property, plant and equipment	296	136
Net change in other assets	(48)	(227)
Net cash used in investing activities	(49,255)	(6,710)
Cash flows from financing activities:
Net proceeds from issuance of common stock	77,823	0
Payments on long-term debt	0	(5,476)
Employee stock purchases	316	235
Net cash provided by (used in) financing activities	78,139	(5,241)
Net increase (decrease) in cash and cash equivalents	24,638	(9,087)
Cash and cash equivalents, beginning of period	53,782	50,810
Cash and cash equivalents, end of period	78,420	41,723
Guarantor Subsidiaries
Cash flows from operating activities:
Net loss	7,540	(8,934)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	12,381	13,167
Stock-based compensation	180	263
Net gain on disposition of property, plant and equipment	(261)	(123)
Non-cash restructuring costs		646
Net loss of unconsolidated joint ventures		6,069
Decrease in trade receivables	32,164	30,606
Increase in inventories	(461)	(283)
Decrease in accounts payable and accrued liabilities	(19,464)	(10,551)
Other changes in operating assets and liabilities, net	11,763	(24,362)
Net cash provided by (used in) operating activities	43,842	6,498
Cash flows from investing activities:
Payment for acquisition	(42,950)
Purchase of property, plant and equipment	(5,880)	(6,601)
Proceeds from disposition of property, plant and equipment	296	136
Net change in other assets	(119)	(2,214)
Net cash used in investing activities	(48,653)	(8,679)
Cash flows from financing activities:
Employee stock purchases	217	170
Net cash provided by (used in) financing activities	217	170
Net increase (decrease) in cash and cash equivalents	(4,594)	(2,011)
Cash and cash equivalents, beginning of period	44,111	36,122
Cash and cash equivalents, end of period	39,517	34,111
Parent Company
Cash flows from operating activities:
Net loss	(13,412)	(14,814)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	55	15
Interest expense related to amortization of debt issue costs and debt discount	1,219	3,049
Stock-based compensation	204	361
Gain on convertible debt repayment		(2,025)
Decrease in accounts payable and accrued liabilities	(16,659)	(11,421)
Other changes in operating assets and liabilities, net	(19,495)	21,201
Net cash provided by (used in) operating activities	(48,088)	(3,634)
Cash flows from investing activities:
Purchase of property, plant and equipment	(673)	(18)
Net change in other assets	71	1,987
Net cash used in investing activities	(602)	1,969
Cash flows from financing activities:
Net proceeds from issuance of common stock	77,823
Payments on long-term debt		(5,476)
Employee stock purchases	99	65
Net cash provided by (used in) financing activities	77,922	(5,411)
Net increase (decrease) in cash and cash equivalents	29,232	(7,076)
Cash and cash equivalents, beginning of period	9,671	14,688
Cash and cash equivalents, end of period	$ 38,903	$ 7,612