Discontinued Operations Operating Results, Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net sales (1)			$ 0
Loss from discontinued operations (2)			(1,201)
Income tax expense			(288)
Loss on sale of discontinued operations (3)			(487)
Income tax benefit on sale of discontinued operations			61
Loss from discontinued operations, net of income tax	$ 0	$ 0	(1,915)
Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]
Discontinued Operations, Accumulated Other Comprehensive Income Reclassified to Earnings			$ 34,697