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DERIVATIVE FINANCIAL INSTRUMENTS (Details) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Jan. 31, 2018 USD ($) shares $ / shares	Jul. 01, 2018 USD ($)	Jun. 25, 2017 USD ($)	Jan. 01, 2018 shares
Derivative [Line Items]
Proceeds from sale of warrants \| $	$ 18,100	$ 18,147	$ 0
Convertible Senior Notes Due 2023 [Member] \| Convertible Debt [Member]
Derivative [Line Items]
Debt conversion shares issued if converted (in shares) \| shares	1,962,790
Debt conversion price (in dollars per share) \| $ / shares	$ 87.89
Shares issued under warrant (in shares) \| shares				1,962,790
Warrant Transactions [Member] \| Convertible Debt [Member]
Derivative [Line Items]
Initial warrant strike price (in dollars per share) \| $ / shares	$ 113.93
Designated as Hedging Instrument [Member] \| Convertible Debt Contract [Member]
Derivative [Line Items]
Payments for derivatives \| $	$ 31,500