| **Redeemable Noncontrolling Interests - Textual (Details)** | 12 Months Ended |         | 3 Months Ended |        |
|-------------------------------------------------------------|-----------------|---------|----------------|--------|
||
| **Redeemable Noncontrolling Interest [Line Items]**         |            |    |           |   |   |
| Affiliates Ownership Percentage                             |            | 100.00% |           |   | 100.00% |
| Affiliates Ownership Percentage, Reduction                  | 55.00%          |    | 50.00%         | 56.00% |   |
| Ownership Percentage Held by the Affiliates                 |            |    |           | 50.00% |   |

| X                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of ownership by the Company in the investee accounted for under the equity or cost methods of accounting.
+ References
No definition available.
+ Details**Name:**hls_AffiliatesOwnershipPercentage**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The remaining percentage of ownership by the Company in the investee accounted for under the equity or cost methods of accounting after a reduction.
+ References
No definition available.
+ Details**Name:**hls_AffiliatesOwnershipPercentageReduction**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.
+ References
No definition available.
+ Details**Name:**us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RedeemableNoncontrollingInterestLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |