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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

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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

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Namespace Prefix:	ryb_
Data Type:	num:percentItemType
Balance Type:	na
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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

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