LONG-TERM DEBT - Senior Secured Notes (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended	9 Months Ended
	Jul. 16, 2018	Sep. 24, 2017	Jul. 01, 2018	Sep. 24, 2017	Sep. 30, 2018
Debt Instrument [Line Items]
Amount of debt redeemed		$ 16,900		$ 16,900
Face Value					$ 750,418
9.00% senior secured notes due in 2022
Debt Instrument [Line Items]
Amount of debt redeemed	$ 344,100	$ 1,700	$ 75,000	$ 1,700
9.00% senior secured notes due in 2026
Debt Instrument [Line Items]
Redemption of debt as a percentage of principle amount	100.00%
Minimum percentage of loan amount maintain	25.00%
Face Value					310,000
Repurchase price (as percent)	101.00%
9.00% senior secured notes due in 2026 | Maximum
Debt Instrument [Line Items]
Redemption of debt as a percentage of principle amount	40.00%
7.795% tranche A junior term loan due in 2030
Debt Instrument [Line Items]
Face Value					157,083
7.150% unsecured debentures due in 2027
Debt Instrument [Line Items]
Face Value					7,105
6.875% unsecured debentures due in 2029
Debt Instrument [Line Items]
Face Value					$ 82,764