Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

Name:	us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Medicare Part D (Details) - USD ($) $ in Thousands	Dec. 02, 2017	Sep. 30, 2017	Mar. 04, 2017
Medicare Part D
Accounts receivable, net	$ 279,148		$ 245,766
Accrued salaries, wages and other current liabilities
Medicare Part D
Liabilities under reinsurance contracts	$ 130,211		$ 145,903
EIC
Medicare Part D
Minimum amount of capital and surplus required by regulatory requirements		$ 36,426