Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6386783&loc=d3e4542-108314

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 4
-Section 7
-Paragraph 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Concepts (CON)
-Number 6
-Paragraph 86
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_InventoryWriteDown
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Fair Value Disclosures (Details Textual) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
Fair Value Disclosures (Details Textual) (USD $)	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2011	Aug. 31, 2010	Nov. 30, 2010
Additional Fair Value Disclosures (Textuals)
Total inventory impairments	$ 328,000	$ 1,434,000	$ 21,414,000	$ 8,269,000	$ 9,800,000
Fair Value Disclosures (Textuals)
Long-lived assets held and used, Carrying Value	51,300,000		51,300,000		21,400,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Additional Fair Value Disclosures (Textuals)
Long-lived assets held and used			29,900,000		11,600,000
Fair Value, Measurements, Nonrecurring [Member]
Additional Fair Value Disclosures (Textuals)
Long-lived assets held and used			$ 29,863,000		$ 11,570,000