GOODWILL AND PURCHASED INTANGIBLE ASSETS GOODWILL AND PURCHASED INTANGIBLE ASSETS - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 28, 2020	Mar. 28, 2020
Segment Reporting Information [Line Items]
Goodwill, measurement period adjustment		$ 1,517
Goodwill, beginning balance		1,278,380
Impairment prior to re-segmentation	$ (323,100)	(323,088)
Allocation due to re-segmentation		0
Impairment after re-segmentation	(323,100)	(323,088)
Goodwill, ending balance	796,216	796,216
Poly Segment
Segment Reporting Information [Line Items]
Goodwill, measurement period adjustment		1,517
Goodwill, beginning balance		1,278,380
Impairment prior to re-segmentation		(323,088)
Allocation due to re-segmentation		(956,809)
Impairment after re-segmentation		(323,088)
Goodwill, ending balance	0	0
Products Segment
Segment Reporting Information [Line Items]
Goodwill, beginning balance		0
Impairment prior to re-segmentation		0
Allocation due to re-segmentation		789,561
Impairment after re-segmentation		0
Goodwill, ending balance	628,968	628,968
Services Segment
Segment Reporting Information [Line Items]
Goodwill, beginning balance		0
Impairment prior to re-segmentation		0
Allocation due to re-segmentation		167,248
Impairment after re-segmentation		0
Goodwill, ending balance	$ 167,248	167,248
Voice And Video
Segment Reporting Information [Line Items]
Impairment prior to re-segmentation		(160,593)
Impairment after re-segmentation		(160,593)
Voice And Video \| Poly Segment
Segment Reporting Information [Line Items]
Impairment prior to re-segmentation		0
Impairment after re-segmentation		0
Voice And Video \| Products Segment
Segment Reporting Information [Line Items]
Impairment prior to re-segmentation		(160,593)
Impairment after re-segmentation		$ (160,593)

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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