Sale of Pharmacy Prescription Files (Details) (Under Performing Pharmacies [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 30, 2014 business_unit
Under Performing Pharmacies [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of business units sold	3
Gain on sale of prescription files	$ 1.2

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

No definition available.

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