ORGANIZATION AND OPERATIONS OF THE COMPANY - Management's Plans in Response to Covid-19 and Fiscal Years (Details)		3 Months Ended					12 Months Ended
	Apr. 08, 2020 contract	Apr. 03, 2020 segment	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Summary of Significant Accounting Policies [Line Items]
Number of reporting segments | segment		2
Length of fiscal period				91 days	91 days	91 days	364 days	364 days	364 days
Number of contracts cancelled | contract	0
Energy Segment
Summary of Significant Accounting Policies [Line Items]
Percentage of revenue considered nonessential		40.00%
Other Energy
Summary of Significant Accounting Policies [Line Items]
Percentage of revenue considered essential		60.00%
Customer Concentration Risk | Revenue from Contract with Customer Benchmark
Summary of Significant Accounting Policies [Line Items]
Customer concentration risk percentage		29.20%				27.50%
Customer Concentration Risk | Revenue from Contract with Customer Benchmark | Energy Segment
Summary of Significant Accounting Policies [Line Items]
Customer concentration risk percentage		45.30%				33.80%
Minimum
Summary of Significant Accounting Policies [Line Items]
Length of fiscal period		364 days	91 days
Maximum
Summary of Significant Accounting Policies [Line Items]
Length of fiscal period		371 days	98 days