Assets and Liabilities Held for Sale (Details) - Assets Held-for-sale - Information Technology Infrastructure Support Service - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2016	Nov. 01, 2015	Jul. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of assets		$ 700
Loss on disposal of discontinued operations	$ 100
Assets included as part of continuing operations
Cash and cash equivalents		1,537	$ 825
Trade accounts receivable, net		15,671	14,591
Recoverable income taxes		165	54
Prepaid insurance and other assets		4,886	3,573
Property, equipment and software, net		189	142
Purchased intangible assets		495	495
Total major classes of assets of discontinued operations - Computer Systems		22,943	19,680
Liabilities included as part of continuing operations
Accrued compensation		3,509	2,439
Accounts payable		1,387	684
Accrued taxes other than income taxes		1,165	775
Accrued insurance and other		523	586
Deferred revenue		761	1,087
Total major classes of liabilities of discontinued operations - Computer Systems		$ 7,345	$ 5,571