Contract Assets and Contract Liabilities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 28, 2021	Mar. 29, 2020
Revenue from Contract with Customer [Abstract]
Increase (decrease) in contract assets	$ 34.9
Increase (decrease) in contract liabilities	(32.3)
Recognition of contract liabilities	$ 84.4	$ 38.0

Increase (Decrease) in Contract with Customer, Liability, Including Foreign Currency Exchange Effects

No definition available.

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Namespace Prefix:	pae_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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=121604090&loc=SL49130549-203045

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Amount of increase (decrease) in 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

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Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

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