Condensed Consolidating Financial Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (25,198)	$ (10,082)	$ (18,114)	$ (11,516)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization			25,856	26,460
Interest expense related to amortization of debt issue costs and debt discount	4,500	600	5,042	1,153
Stock-based compensation	700	500	1,339	1,016
Deferred income taxes			477	214
Net loss on disposition of property, plant and equipment			113	373
Loss (gain) on sale of discontinued operations, net of income taxes			241	(3,117)
Net loss of unconsolidated joint ventures			234	133
Decrease in trade receivables			28,347	30,911
Decrease (increase) in inventories			(10,628)	(9,754)
Decrease in accounts payable and accrued liabilities			(47,580)	(23,598)
Other changes in operating assets and liabilities, net			(8,769)	(5,530)
Net cash provided by (used in) operating activities			(23,442)	6,745
Cash flows from investing activities:
Business acquisitions			(1,200)	(60,619)
Investments in unconsolidated joint ventures			(125)	(1,000)
Purchase of property, plant and equipment	(8,703)	(9,056)	(17,474)	(15,944)
Proceeds from disposition of property, plant and equipment			640	358
Proceeds from sale of discontinued operations			0	4,666
Net decrease in long-term receivables and deposits			3,650	5,825
Net change in other assets			(344)	24
Net cash provided by (used in) investing activities			(14,853)	(66,690)
Cash flows from financing activities:
Net proceeds from issuance of long-term debt			414,675	146,200
Payments on long-term debt			(448,736)	(7,792)
Dividends paid to non-controlling interest in consolidated subsidiary			(927)	0
Employee stock purchases			464	454
Net cash provided by (used in) financing activities			(34,524)	138,862
Net increase (decrease) in cash and cash equivalents			(72,819)	78,917
Cash and cash equivalents, beginning of period			152,542	75,316
Cash and cash equivalents, end of period	79,723	154,233	79,723	154,233
Consolidation, Eliminations
Cash flows from operating activities:
Net income (loss)	(12,325)	(3,574)	(34,125)	(15,225)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Equity in earnings of subsidiaries	12,325	3,574	34,125	15,225
Guarantor Subsidiaries
Cash flows from operating activities:
Net income (loss)	11,486	2,894	32,325	14,619
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization			24,223	25,582
Stock-based compensation			496	404
Deferred income taxes			295	214
Net loss on disposition of property, plant and equipment			112	328
Loss (gain) on sale of discontinued operations, net of income taxes			45	(3,117)
Decrease in trade receivables			28,597	30,264
Decrease (increase) in inventories			(10,071)	(11,139)
Decrease in accounts payable and accrued liabilities			(23,170)	(21,882)
Other changes in operating assets and liabilities, net			2,554	(15,224)
Net cash provided by (used in) operating activities			55,406	20,049
Cash flows from investing activities:
Business acquisitions			(1,200)	(3,100)
Investments in unconsolidated joint ventures			(125)
Purchase of property, plant and equipment			(14,496)	(13,505)
Proceeds from disposition of property, plant and equipment			640	358
Proceeds from sale of discontinued operations				4,666
Net decrease in long-term receivables and deposits			2,584	5,527
Net change in other assets			(437)	(192)
Net cash provided by (used in) investing activities			(13,034)	(6,246)
Cash flows from financing activities:
Employee stock purchases			342	344
Intercompany transfers			(39,633)
Net cash provided by (used in) financing activities			(39,291)	344
Net increase (decrease) in cash and cash equivalents			3,081	14,147
Cash and cash equivalents, beginning of period			33,552	70,713
Cash and cash equivalents, beginning of period			33,552
Cash and cash equivalents, end of period	36,633	84,860	36,633	84,860
Cash and cash equivalents, end of period	36,633		36,633
Non-Guarantor Subsidiaries
Cash flows from operating activities:
Net income (loss)	1,098	916	2,304	836
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization			1,421	748
Deferred income taxes			182
Net loss on disposition of property, plant and equipment			1
Loss (gain) on sale of discontinued operations, net of income taxes			196
Net loss of unconsolidated joint ventures			234	133
Decrease in trade receivables			(250)	647
Decrease (increase) in inventories			(557)	1,385
Decrease in accounts payable and accrued liabilities			2,248	(331)
Other changes in operating assets and liabilities, net			(7,521)	1,320
Net cash provided by (used in) operating activities			(1,742)	4,738
Cash flows from investing activities:
Investments in unconsolidated joint ventures				(1,000)
Purchase of property, plant and equipment			(259)	(678)
Net cash provided by (used in) investing activities			(259)	(1,678)
Cash flows from financing activities:
Dividends paid to non-controlling interest in consolidated subsidiary			(927)
Employee stock purchases			16
Intercompany transfers			123
Net cash provided by (used in) financing activities			(788)
Net increase (decrease) in cash and cash equivalents			(2,789)	3,060
Cash and cash equivalents, beginning of period			5,764	34
Cash and cash equivalents, end of period	2,975	3,094	2,975	3,094
Parent Company
Cash flows from operating activities:
Net income (loss)	(25,457)	(10,318)	(18,618)	(11,746)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization			212	130
Interest expense related to amortization of debt issue costs and debt discount			5,042	1,153
Stock-based compensation			843	612
Net loss on disposition of property, plant and equipment				45
Equity in earnings of subsidiaries	(12,325)	(3,574)	(34,125)	(15,225)
Decrease in accounts payable and accrued liabilities			(26,658)	(1,385)
Other changes in operating assets and liabilities, net			(3,802)	8,374
Net cash provided by (used in) operating activities			(77,106)	(18,042)
Cash flows from investing activities:
Business acquisitions				(57,519)
Purchase of property, plant and equipment			(2,719)	(1,761)
Net decrease in long-term receivables and deposits			1,066	298
Net change in other assets			93	216
Net cash provided by (used in) investing activities			(1,560)	(58,766)
Cash flows from financing activities:
Net proceeds from issuance of long-term debt			414,675	146,200
Payments on long-term debt			(448,736)	(7,792)
Employee stock purchases			106	110
Intercompany transfers			39,510
Net cash provided by (used in) financing activities			5,555	138,518
Net increase (decrease) in cash and cash equivalents			(73,111)	61,710
Cash and cash equivalents, beginning of period			113,226	4,569
Cash and cash equivalents, end of period	$ 40,115	$ 66,279	$ 40,115	$ 66,279