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Commitments and Contingencies (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Nov. 30, 2012 | Nov. 30, 2011 | Aug. 31, 2012
Commitments and Contingencies |  |  |
Lease expense related to noncancellable operating leases | $ 202,000 | $ 200,000 |
Future noncancellable minimum rental payments |  |  |
Remainder of 2013 | 669,000 |  |
2014 | 867,000 |  |
2015 | 945,000 |  |
2016 | 888,000 |  |
2017 | 272,000 |  |
Thereafter | 246,000 |  |
Total | 3,887,000 |  |
Purchase Obligations |  |  |
Purchase commitments for property, plant and equipment | $ 3,700,000 |  | $ 3,700,000

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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