Investments - Additional Information (Details) - USD ($) $ in Millions	Feb. 02, 2019	Feb. 03, 2018
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Assets held by insurance regulators	$ 3.4	$ 6.8

Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 825
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=75763970&loc=SL75763979-209797

Name:	us-gaap_AssetsHeldByInsuranceRegulators
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant