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Namespace Prefix:	rtc_
Data Type:	xbrli:stringItemType
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Period Type:	duration

Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation.

No definition available.

Name:	rtc_DisposalGroupIncludingDiscontinuedOperationOtherOperatingExpenses
Namespace Prefix:	rtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount before tax of an increase (decrease) to a gain (loss) previously reported in discontinued operations in a prior period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Period Type:	duration

Amount of gross profit attributable to disposal group, including, but not limited to, discontinued operation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

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