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Disaggregation of Revenue and Contract Balances - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disaggregation Of Revenue [Abstract] |  |
Revenue from contracts classified as lump sum | 91.60% |
Revenue from exclusively time and material contracts | 8.40% |
Remaining performance obligations | $ 94.8 |
Contract with customer, liability, revenue recognized | $ 0.9 | $ 2.9

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- Definition Revenue from contracts classified as lump sum. + References No definition available. + Details
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Namespace Prefix: | bwmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue from exclusively time and material contracts. + References No definition available. + Details
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Namespace Prefix: | bwmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant