Discontinued Operations Operating Results, Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jan. 31, 2014	Apr. 30, 2013	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated Other Comprehensive Income Attributable to Disposal Group, Discontinued Operations	$ 30,000			$ 30,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	5,907		1,987	11,701	2,884
Discontinued Operation, Tax Effect of Discontinued Operation	1,475		(1,666)	(1,060)	(1,969)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	4,432		3,653	12,761	4,853
Disposal Group, Including Discontinued Operations, Loss (Gain) on Write-down		(15,658)
Disposal Group, Including Discontinued Operation, Revenue	$ 49,759		$ 52,846	$ 115,616	$ 119,839