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Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) - March 2018 Repurchase Program [Member] - USD ($) $ in Millions | Oct. 31, 2020 | May 05, 2018
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Amount Authorized |  | $ 250
Remaining authorized repurchase amount | $ 79 |

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=lb_March2018RepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |