Borrowings (Details) (USD $) In Millions, unless otherwise specified	Jul. 12, 2012
5.05% fixed rate senior note [Member]
Borrowings (Textual) [Abstract]
Fixed Rate Senior Note	$ 20.0
Fixed Rate Senior Note	5.05%
5.2% fixed interest rate senior note [Member]
Borrowings (Textual) [Abstract]
Floating Rate Senior Note	$ 80.0
Fixed Rate Senior Note	5.20%

Interest rate stated in the contractual debt agreement.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant