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Commitments and Contingencies (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2012 | Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2010
Commitments and Contingencies |  |  |  |
Outstanding deposits maintained for noncancellable operating leases |  | $ 168,000 | $ 214,000 |
Lease expense related to noncancellable operating leases |  | 802,000 | 750,000 | 530,000
Future noncancellable minimum rental payments |  |  |  |
2013 |  | 845,000 |  |
2014 |  | 837,000 |  |
2015 |  | 912,000 |  |
2016 |  | 861,000 |  |
2017 |  | 264,000 |  |
Thereafter |  | 239,000 |  |
Total |  | 3,958,000 |  |
Purchase Obligations |  |  |  |
Purchase commitments for property, plant and equipment |  | 3,700,000 | 10,900,000 |
Litigation |  |  |  |
Accrued liability recognized | 1,500,000 | 1,500,000 |  |
Cree |  |  |  |
Litigation |  |  |  |
Accrued liability recognized | $ 1,500,000 |  |  |

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