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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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