Investments - Additional Information (Details) (USD $) In Millions, unless otherwise specified	May 02, 2015	Jan. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Unrealized Gain (Loss)	$ (0.1)	$ 0
Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Assets Held by Insurance Regulators	$ 7.2	$ 7.2

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/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 320

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28366721&loc=d3e22002-158495

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