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Leases - Additional Lease Information (Details)	3 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Leases [Abstract]
Lease revenue as a percentage of total (percentage)	0.02	3

X

- Definition

Lease Revenue, Percentage Of Total Revenue

+ References

No definition available.

+ Details

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Namespace Prefix:	holx_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration