SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (Subsequent event, USD $)	0 Months Ended	12 Months Ended	0 Months Ended
	Feb. 05, 2013 Locker	Dec. 29, 2012 Locker	Feb. 15, 2013 Manganese Materials Company Pty. Ltd.
Subsequent Events
Ownership percentage acquired	100.00%
Annual sales		$ 80,000,000
Purchase price	54,900,000
Additional purchase price upon the achievement of certain gross profit targets	7,900,000
Period over which additional consideration is to be paid	2 years
Proceeds from sale of business			30,000,000
Deferred tax benefits associated with sale of business			$ 3,000,000