Represents the number of common stock shares subject aggregate of sponsor surrendered.

No definition available.

Name:	osiun_AggregateOfSponsorSharesSurrendered
Namespace Prefix:	osiun_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Aggregate outstanding founder shares.

+ References

No definition available.

+ Details

Name:	osiun_AggregateOutstandingFounderShares
Namespace Prefix:	osiun_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Common stock forfeited.

+ References

No definition available.

+ Details

Name:	osiun_CommonStockForfeited
Namespace Prefix:	osiun_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of votes that each common share is entitled.

+ References

No definition available.

+ Details

Name:	osiun_CommonStockNumberOfVotesPerShare
Namespace Prefix:	osiun_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The ratio to be applied to the stock in a conversion of convertible stock.

+ References

No definition available.

+ Details

Name:	osiun_ConvertibleStockConversionRatio1
Namespace Prefix:	osiun_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Forfeited founder shares.

+ References

No definition available.

+ Details

Name:	osiun_ForfeitedFounderShares
Namespace Prefix:	osiun_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=122040564&loc=d3e177068-122764

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (27)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_TemporaryEquityParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(27)(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_TemporaryEquitySharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

+ Details

Name:	us-gaap_TemporaryEquitySharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

+ Details

Name:	us-gaap_TemporaryEquitySharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=osiun_SponsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=osiun_FounderSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=osiun_CommonClassaSubjectToRedemptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=osiun_CommonStockSubjectToRedemptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCKHOLDERS' EQUITY - Common Stock Shares (Details)	1 Months Ended		9 Months Ended
STOCKHOLDERS' EQUITY - Common Stock Shares (Details)	Jul. 31, 2021 shares	May 31, 2021 shares	Sep. 30, 2021 Vote $ / shares shares	Feb. 28, 2021 shares	Dec. 31, 2020 $ / shares shares
Sponsor \| Founder Shares
Class of Stock [Line Items]
Shares surrendered				1,437,500
Class A Common Stock Subject to Redemption
Class of Stock [Line Items]
Temporary equity par value \| $ / shares			$ 0.0001		$ 0.0001
Common shares, votes per share \| Vote			1
Temporary equity shares issued			23,000,000		0
Temporary equity, shares outstanding			23,000,000		0
Temporary equity shares authorised			100,000,000		100,000,000
Class B common stock
Class of Stock [Line Items]
Ratio to be applied to the stock in the conversion			20
Class B Common stock subject to redemption
Class of Stock [Line Items]
Temporary equity par value \| $ / shares			$ 0.0001		$ 0.0001
Common shares, votes per share \| Vote			1
Common stock forfeited	862,500
Temporary equity shares issued			5,750,000		5,750,000
Temporary equity, shares outstanding			5,750,000		5,750,000
Temporary equity shares authorised			60,000,000		60,000,000
Class B Common stock subject to redemption \| Founder Shares
Class of Stock [Line Items]
Aggregate founder shares		6,612,500
Class B Common stock subject to redemption \| Sponsor
Class of Stock [Line Items]
Forfeited founder shares		575,000
Class B Common stock subject to redemption \| Sponsor \| Founder Shares
Class of Stock [Line Items]
Shares surrendered				1,437,500