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Stock Bonus Plan - Summary of Future expense of Unvested Awards (Details) $ in Thousands | Mar. 31, 2021 USD ($)
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Schedule Of Future Expense Of Unvested Awards [Abstract] |
2021 | $ 2,343
2022 | 2,071
2023 | 1,832
2024 | 951
Total | $ 7,197

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- Definition Future expense of unvested awards. + References No definition available. + Details
Name: | bwmn_FutureExpenseOfUnvestedAwards
Namespace Prefix: | bwmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Future expense of unvested awards, reminder of fiscal year. + References No definition available. + Details
Name: | bwmn_FutureExpenseOfUnvestedAwardsReminderOfFiscalYear
Namespace Prefix: | bwmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Future expense of unvested awards, year one. + References No definition available. + Details
Name: | bwmn_FutureExpenseOfUnvestedAwardsYearOne
Namespace Prefix: | bwmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future expense of unvested awards, year three. + References No definition available. + Details
Name: | bwmn_FutureExpenseOfUnvestedAwardsYearThree
Namespace Prefix: | bwmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future expense of unvested awards, year two. + References No definition available. + Details
Name: | bwmn_FutureExpenseOfUnvestedAwardsYearTwo
Namespace Prefix: | bwmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Schedule of future expense of unvested awards. + References No definition available. + Details
Name: | bwmn_ScheduleOfFutureExpenseOfUnvestedAwardsAbstract
Namespace Prefix: | bwmn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration