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	Apr. 03, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 1,278,380
Acquisition measurement period adjustments		1,517
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
Goodwill	796,216	1,278,380	$ 796,216
Poly Reportable Segment
Goodwill [Roll Forward]
Goodwill, beginning balance		1,278,380
Acquisition measurement period adjustments		1,517
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
Goodwill	0	0	0
Products Reportable Segment
Goodwill [Roll Forward]
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
Goodwill	628,968	628,968	628,968
Services Reportable Segment
Goodwill [Roll Forward]
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
Goodwill	$ 167,248	167,248	$ 167,248
Voice And Video
Goodwill [Roll Forward]
Impairment prior to re-segmentation		(160,593)
Impairment after re-segmentation		(160,593)
Voice And Video \| Poly Reportable Segment
Goodwill [Roll Forward]
Impairment prior to re-segmentation		0
Impairment after re-segmentation		0
Voice And Video \| Products Reportable Segment
Goodwill [Roll Forward]
Impairment prior to re-segmentation		(160,593)
Impairment after re-segmentation		$ (160,593)

Goodwill, measurement period adjustment

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 350
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