ORGANIZATION AND OPERATIONS OF THE COMPANY - Management's Plans in Response to Covid-19 and Fiscal Years (Details)		3 Months Ended								6 Months Ended	12 Months Ended
	Aug. 07, 2020 contract	Jan. 01, 2021	Oct. 02, 2020	Jul. 03, 2020	Apr. 03, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Jul. 03, 2020 segment	Jan. 01, 2021	Dec. 27, 2019
Summary of Significant Accounting Policies [Line Items]
Number of reporting segments | segment										2
Length of fiscal period		91 days	91 days	91 days	98 days	91 days	91 days	91 days	91 days		371 days	364 days
Subsequent Event
Summary of Significant Accounting Policies [Line Items]
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%
Minimum
Summary of Significant Accounting Policies [Line Items]
Length of fiscal period						91 days				364 days
Maximum
Summary of Significant Accounting Policies [Line Items]
Length of fiscal period						98 days				371 days