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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Changes in the carrying amount of the intangible assets
Beginning Balance			$ 847
Amortization		0	(149)
Impairment	916	0	(916)
Additions		0	218
Ending Balance		0
Process Technology [Member]
Changes in the carrying amount of the intangible assets
Beginning Balance			42
Amortization		0	(42)
Impairment		0
Additions		0
Ending Balance		0
Software Under Development [Member]
Changes in the carrying amount of the intangible assets
Beginning Balance			805
Amortization		0	(107)
Impairment		0	(916)
Additions		0	218
Ending Balance		$ 0

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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