Contract Liabilities - Schedule of Contract Liabilities (Details)	12 Months Ended
Mar. 31, 2026 HKD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 HKD ($)
Contract with Customer, Liability [Abstract]
Balance at beginning of the year	$ 53,953,394	$ 6,881,811	$ 59,363,407
Addition	10,782,604	1,375,332	1,464,433
Acquisition of subsidiaries	13,000	1,658
Deconsolidation of subsidiaries	(1,801,242)	(229,750)
Recognized to revenue during the year	(21,472,567)	(2,738,848)	(6,874,446)
Balance at end of year	$ 41,475,189	$ 5,290,203	$ 53,953,394

The amount of contract with customer liability acquisition of subsidiaries.

No definition available.

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Namespace Prefix:	ritr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Contract with customer liability addition

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The amount of contract with customer liabilities deconsolidation of subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	ritr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

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