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RESTRUCTURING AND ASSET IMPAIRMENT - Restructuring Costs by Related to RMS Restructuring Initiative (Details) - USD ($)	3 Months Ended		24 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	$ 1,549,000	$ 638,000
Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	1,416,000	585,000
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	133,000	53,000
Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	400,000	616,000
Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	267,000	563,000
Severance and Transition Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	133,000	53,000
Asset Impairments and Other Costs
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	1,149,000	22,000
Asset Impairments and Other Costs | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	1,149,000	22,000
Asset Impairments and Other Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	0	0
RMS
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	301,000	0	$ 20,100,000
RMS | Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs			$ 1,200,000
2017 RMS Restructuring | RMS
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	$ 0	1,038,000
2017 RMS Restructuring | RMS | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		868,000
2017 RMS Restructuring | RMS | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		170,000
2017 RMS Restructuring | RMS | Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		523,000
2017 RMS Restructuring | RMS | Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		353,000
2017 RMS Restructuring | RMS | Severance and Transition Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		170,000
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		515,000
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		515,000
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		$ 0

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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