Goodwill And Other Intangible Assets (Reconciliation Of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Beginning balance, Gross Carrying Amount	$ 81,283	$ 81,882
Beginning balance, Accumulated Amortization	(45,238)	(40,575)
Beginning balance, Net Intangible Assets	36,045	41,307
Amortization expense, Accumulated Amortization	(6,778)	(5,154)
Amortization expense, Net Intangible Assets	(6,778)	(5,154)
Retirements, Gross Carrying Amount		(775)
Retirements, Accumulated Amortization		600
Retirements, Net Intangible Assets		(175)
Foreign exchange translation, Gross Carrying Value	(4,193)	176
Foreign exchange translation, Accumulated Amortization	2,796	(109)
Foreign exchange translation, Net Intangible Assets	(1,397)	67
Ending balance, Gross Carrying Amount	87,090	81,283
Ending balance, Accumulated Amortization	(49,220)	(45,238)
Ending balance, Net Intangible Assets	37,870	$ 36,045
Ifil [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Acquired, Gross Carrying Amount	3,800
Intangible acquired, Net Intangible Assets	3,800
Northern Technical [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Acquired, Gross Carrying Amount	6,200
Intangible acquired, Net Intangible Assets	$ 6,200