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Capacity Rationalization Charges Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Restructuring Cost and Reserve
Charges recognized during the year	$ 8,000	$ 0	$ 70,000	$ 0
Estimated remaining expense			$ 0

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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