Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended
Jun. 30, 2012	Jul. 31, 2012 Subsequent Event [Member] ADP Indemnity [Member]
Subsequent Event [Line Items]
Premium paid to enter into a reinsurance arrangement		$ 141
Threshold of coverage for all losses per occurrence covered by reinsurance arrangement, next fiscal year	$ 1

Cash payments made for reinsurance during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 27

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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