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Revenue From Contracts With Customers (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020
Revenue from Contract with Customer [Abstract]
Percent of revenue from contract with customer compared to total revenue	33.00%	30.00%	34.00%	29.00%
Contract with customer, asset, cumulative catch-up adjustment to revenue, modification of contract			$ 19.2
Revenue recognized that was included in contract liability balance at beginning of period	$ 0.3	$ 0.2	$ 1.4	$ 1.3

X

- Definition

Percent Of Revenue From Contract With Customer Compared To Total Revenue

+ References

No definition available.

+ Details

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Namespace Prefix:	itgr_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from contract modification which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

+ Details

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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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