Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended
	Oct. 31, 2014	Jul. 31, 2014
Indefinite-lived Intangible Assets [Line Items]
Goodwill impairment	$ 0
Intangible assets, net	42,081,000	36,045,000
Increase of balance from intangible assets	6,100,000
Amortization of existing intangible assets	1,900,000
Northern Technical [Member]
Indefinite-lived Intangible Assets [Line Items]
Amount of intangibles acquired	$ 8,300,000