Acquisition of Kleer Lumber (Details) (USD $)	3 Months Ended			6 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Intangible assets acquired:
Revenue	$ 140,988,000		$ 129,632,000	$ 290,561,000	$ 267,059,000
Net loss	(8,260,000)		(20,558,000)	(14,132,000)	(44,306,000)
Minimum | Customer Relationships
Intangible assets acquired:
Estimated useful lives				5 years
Minimum | Trade name
Intangible assets acquired:
Estimated useful lives				5 years
Minimum | Other
Intangible assets acquired:
Estimated useful lives				3 years
Maximum | Customer Relationships
Intangible assets acquired:
Estimated useful lives				15 years
Maximum | Trade name
Intangible assets acquired:
Estimated useful lives				20 years
Maximum | Other
Intangible assets acquired:
Estimated useful lives				17 years
Kleer Lumber, Inc.
Acquisition
Total cash consideration of acquisition		43,300,000
Fees for advisory, legal and other professional services	900,000			900,000
Estimated fair values of assets acquired and liabilities assumed
Current assets		5,818,000
Current liabilities		(3,093,000)
Property, plant and equipment		4,098,000
Goodwill		15,505,000
Net assets acquired		43,250,000
Intangible assets acquired:
Estimated useful lives of the identified intangible assets		16 years
Period over which goodwill is expected to be deductible for tax purpose	15 years
Revenue	8,100,000			8,100,000
Net loss	(200,000)			(200,000)
Pro forma consolidated revenue and net loss
Revenue	140,988,000		138,715,000	297,967,000	283,843,000
Net loss	(7,835,000)		(20,237,000)	(13,011,000)	(45,861,000)
Nonrecurring expense related to the fair value adjustment to acquisition-date inventory			500,000		500,000
Kleer Lumber, Inc. | Customer Relationships
Intangible assets acquired:
Intangible assets		12,149,000
Estimated useful lives		15 years
Kleer Lumber, Inc. | Trade name
Intangible assets acquired:
Intangible assets		8,073,000
Kleer Lumber, Inc. | Other
Intangible assets acquired:
Intangible assets		$ 700,000
Estimated useful lives		5 years
Kleer Lumber, Inc. | Minimum
Intangible assets acquired:
Estimated useful lives		5 years
Kleer Lumber, Inc. | Minimum | Trade name
Intangible assets acquired:
Estimated useful lives		5 years
Kleer Lumber, Inc. | Maximum
Intangible assets acquired:
Estimated useful lives		20 years
Kleer Lumber, Inc. | Maximum | Trade name
Intangible assets acquired:
Estimated useful lives		20 years