Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended
	Oct. 31, 2015	Jul. 31, 2015
Indefinite-lived Intangible Assets [Line Items]
Goodwill impairment	$ 0
Intangible assets, net	43,300,000	$ 37,900,000
Amortization of existing intangible assets	1,500,000
Foreign exchange translation decrease of intangible assets	1,100,000
Northern Technical [Member]
Indefinite-lived Intangible Assets [Line Items]
Amount of intangibles acquired	$ 7,000,000