Subsequent Event - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Sep. 28, 2018	Oct. 09, 2018
Subsequent Event [Line Items]
Merger related costs	$ 7.2
Subsequent Event
Subsequent Event [Line Items]
Termination fee payable upon termination of merger agreement		$ 128.9
Subsequent Event \| TransDigm
Subsequent Event [Line Items]
Business acquisition, share price		$ 122.50

Termination fee payable upon termination of merger agreement.

No definition available.

Name:	esl_TerminationFeePayableUponTerminationOfMergerAgreement
Namespace Prefix:	esl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of cash paid during the reporting period for charges associated with the mergers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForMergerRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=esl_TransDigmMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: