| **Significant Accounting Policies - Warranty Period by Segment (Details)** | 12 Months Ended |
|----------------------------------------------------------------------------|-----------------|
||
| Minimum | Communication Systems                                            |            |
| **Warranty Period [Line Items]**                                           |            |
| Warranty Period                                                            | 1 year          |
| Minimum | Space and Intelligence Systems                                   |            |
| **Warranty Period [Line Items]**                                           |            |
| Warranty Period                                                            | 1 year          |
| Minimum | Electronic Systems                                               |            |
| **Warranty Period [Line Items]**                                           |            |
| Warranty Period                                                            | 1 year          |
| Minimum | Critical Networks                                                |            |
| **Warranty Period [Line Items]**                                           |            |
| Warranty Period                                                            | 1 year          |
| Maximum | Communication Systems                                            |            |
| **Warranty Period [Line Items]**                                           |            |
| Warranty Period                                                            | 5 years         |
| Maximum | Space and Intelligence Systems                                   |            |
| **Warranty Period [Line Items]**                                           |            |
| Warranty Period                                                            | 2 years         |
| Maximum | Electronic Systems                                               |            |
| **Warranty Period [Line Items]**                                           |            |
| Warranty Period                                                            | 2 years         |
| Maximum | Critical Networks                                                |            |
| **Warranty Period [Line Items]**                                           |            |
| Warranty Period                                                            | 5 years         |

| X                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Warranty obligations term.
+ References
No definition available.
+ Details**Name:**hrs_WarrantyObligationsTerm**Namespace Prefix:**hrs_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Warranty Period Line Items.
+ References
No definition available.
+ Details**Name:**hrs_WarrantyPeriodLineItems**Namespace Prefix:**hrs_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RangeAxis=us-gaap_MinimumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=hrs_CommunicationSystemsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=hrs_SpaceAndIntelligenceSystemsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=hrs_ElectronicSystemsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=hrs_CriticalNetworksMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RangeAxis=us-gaap_MaximumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |