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Segment Reporting (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Apr. 30, 2013	Apr. 30, 2013 segment
Number of reportable segments		2
Restructuring expenses	$ 1,094	$ 2,796
Industrial Products [Member]
Restructuring expenses	700	1,700
Engine Products [Member]
Restructuring expenses	$ 400	$ 1,100

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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