EMPLOYEE BENEFITS - Contributions (Details) - USD ($)	1 Months Ended			3 Months Ended	9 Months Ended
	Oct. 31, 2016	May 31, 2016	Feb. 29, 2016	Dec. 25, 2016	Sep. 25, 2016	Dec. 27, 2015
Medical cost trend rates
Financing obligations					$ 53,502,000	$ 32,398,000
Pension plan
Medical cost trend rates
Value of contributions to plan			$ 47,100,000
Required pension contribution			$ 0
Term of leases entered into for property contributed to pension plan			11 years
Gain or loss recognized on the contribution of property					0
Financing obligations		$ (25,100,000)
Reduction in plant, property, and equipment		26,200,000
Aggregate Annual Rent Payments On Contributed Property			$ 3,500,000
Proceeds from sale of real property location		$ 34,300,000
Expected | Pension plan
Medical cost trend rates
Proceeds from sale of real property location	$ 4,800,000
Other Operating Income (Expense) | Pension plan
Medical cost trend rates
(Loss) on sale of real property location					$ (1,100,000)
Other Operating Income (Expense) | Expected | Pension plan
Medical cost trend rates
(Loss) on sale of real property location				$ (200,000)