Balance Sheet Components (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Feb. 28, 2013
Inventories
Raw materials	$ 2,999	$ 2,440
Work in process	4,065	3,227
Finished goods	5,952	4,508
Total	13,016	10,175
Property, Plant and Equipment
Total property, plant and equipment	86,706	87,668
Less: Accumulated depreciation, amortization and impairment	(40,064)	(44,286)
Property, plant and equipment, net	46,642	43,382
Impairment of Long-Lived Assets
Impairment of long-lived assets	7,507
Buildings and improvements
Property, Plant and Equipment
Total property, plant and equipment	14,501	14,636
Machinery and equipment
Property, Plant and Equipment
Total property, plant and equipment	64,267	65,237
Leasehold improvements
Property, Plant and Equipment
Total property, plant and equipment	3,143	3,172
Other equipment
Property, Plant and Equipment
Total property, plant and equipment	2,249	2,140
Construction in progress
Property, Plant and Equipment
Total property, plant and equipment	$ 2,546	$ 2,483