SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Recently adopted accounting standards (Details) - USD ($) $ in Thousands	Sep. 29, 2019	Mar. 31, 2019	Dec. 30, 2018
Operating lease right-of-use assets	$ 36,794		$ 0
Present value of lease liabilities	$ 39,057
Accounting Standards Update 2016-02 [Member]
Operating lease right-of-use assets		$ 39,000
Present value of lease liabilities		$ 41,000