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RESTRUCTURING AND ASSET IMPAIRMENTS - Restructuring Costs by Related to RMS Restructuring Initiative (Details) - USD ($)	3 Months Ended		6 Months Ended		24 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 29, 2018
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	$ 1,685,000	$ 1,856,000	$ 3,234,000	$ 2,494,000
Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	727,000	174,000	2,143,000	759,000
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	958,000	1,682,000	1,091,000	1,735,000
Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	1,311,000	1,856,000	1,711,000	2,472,000
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	371,000	174,000	638,000	737,000
Severance and Transition Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	940,000	1,682,000	1,073,000	1,735,000
Asset Impairments and Other Costs
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	374,000	0	1,523,000	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	356,000	0	1,505,000	22,000
Asset Impairments and Other Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	18,000	0	18,000	0
RMS
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs	641,000	0	942,000	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	289,000	$ 0	1,327,000
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		271,000		1,139,000
2017 RMS Restructuring | RMS | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		18,000		188,000
2017 RMS Restructuring | RMS | Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		220,000		743,000
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		202,000		555,000
2017 RMS Restructuring | RMS | Severance and Transition Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		18,000		188,000
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs
Restructuring Cost and Reserve [Line Items]
Total severance and transition costs		69,000		584,000
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		69,000		584,000
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		$ 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
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
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-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
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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-Publisher FASB
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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