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SIGNIFICANT ACCOUNTING POLICIES - Value added taxes (Details) | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2018
SIGNIFICANT ACCOUNTING POLICIES |  |  |
Value added tax rate on gross sales (in percent) | 17.00% | 16.00% |
Value added tax rate for general VAT payer (in percent) |  |  | 6.00%
Value added tax rate for small scale VAT payer (in percent) |  |  | 3.00%

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- Definition The percentage of value added tax rate for general VAT payer where the PRC Ministry of Finance and the State Administration of Taxation officially launched a pilot VAT reform program ("Pilot Program"), applicable to businesses in selected industries + References No definition available. + Details
Name: | ryb_PilotProgramValueAddedTaxRateGeneralVatPayerPercentage
Namespace Prefix: | ryb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of value added tax rate for small scale VAT payer under Pilot Program where the PRC Ministry of Finance and the State Administration of Taxation officially launched a pilot VAT reform program ("Pilot Program"), applicable to businesses in selected industries. + References No definition available. + Details
Name: | ryb_PilotProgramValueAddedTaxRateSmallScaleVatPayerPercentage
Namespace Prefix: | ryb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of value added tax rate on gross sales for general VAT payer. + References No definition available. + Details
Name: | ryb_ValueAddedTaxRateOnGrossSalesPercentage
Namespace Prefix: | ryb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration