Contract Balances and Contract Costs - Disaggregation of Revenue by Service Type (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Nov. 01, 2019	Nov. 02, 2018	Nov. 01, 2019	Nov. 02, 2018
Disaggregation of Revenue [Line Items]
Net revenue	$ 141,332	$ 133,060	$ 410,779	$ 387,999
Managed Security Solutions revenue
Disaggregation of Revenue [Line Items]
Net revenue	109,344	100,521	311,210	297,656
Security and Risk Consulting revenue
Disaggregation of Revenue [Line Items]
Net revenue	$ 31,988	$ 32,539	$ 99,569	$ 90,343

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration