GOODWILL, BRANDS, AND OTHER INTANGIBLE ASSETS, NET (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Franchise stores store	Dec. 31, 2012 Franchise stores store	Dec. 31, 2011 Franchise stores store	Aug. 31, 2011 LuckyVitamin.com	Oct. 02, 2013 Discount Supplements
Acquisitions
Number of franchise stores acquired	16	29	30
Total purchase prices associated with acquisitions	$ 2.9	$ 4.4	$ 3.4	$ 19.8	$ 33.3
Cash paid	1.7	2.1	1.6
Purchase price allocated to goodwill				11.5	24.6
Purchase price allocated to amortizable intangible assets				9.6	9.6
Purchase price allocated to inventory					4.9
Purchase price allocated to accounts receivable					0.5
Purchase price allocated to property and equipment acquired				0.7	0.6
Purchase price allocated to current assets acquired				2.6	0.2
Purchase price allocated to accounts payable assumed					2.8
Purchase price allocated to deferred tax liabilities assumed					2.4
Purchase price allocated to other current liabilities assumed					1.5
Purchase price allocated to other long term liabilities assumed					6.2
Purchase price allocated to net assumed current liabilities				$ 3.9