Discontinued Operations - Additional Information (Details) - Disposed of by Sale - Computer Systems Segment - USD ($)		3 Months Ended	9 Months Ended
	Dec. 01, 2014	Feb. 01, 2015	Jul. 31, 2016	Aug. 02, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal		$ 1,200,000
Restructuring and other related costs		2,200,000		$ 1,709,000
NewNet Communication Technologies, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Note receivable	$ 10,000,000.0
Interest rate	0.50%
Payment term	4 years
Payment to acquire note receivable	$ 4,000,000
Payment term	45 days
Working capital	$ 6,000,000
Notes receivable, fair value	$ 8,400,000
Unamortized discount			$ 1,100,000
Employee Severance
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring and other related costs		900,000
Professional Fees Incurred
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring and other related costs		900,000
Lease Obligation Costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring and other related costs		$ 400,000
Payments for restructuring			2,000,000
Expected cost remaining			$ 200,000
Maximum | NewNet Communication Technologies, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital interest percentage	20.00%