Related Parties (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Payable to Spark
Balance at end of period	$ 3,779
Spark [Member]
Payable to Spark
Balance at beginning of period
Operating costs billed to eOn		13
Payments to Spark		(13)
Balance at end of period