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The following table discloses the primary inputs for the Monte Carlo model used in valuing the April 2024 Notes: (Details) - $ / shares		12 Months Ended
	Apr. 12, 2024	Jun. 30, 2024	Jun. 30, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average of the equity volatility and implied volatility of the public warrants		63.20%	63.60%
Risk-free rate		4.25%	3.30%
Measurement Input, Exercise Price [Member] | Monte Carlo Model [Member] | Earnout [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Closing common share price	$ 3.11	$ 1.73
Term (expiry)	Dec. 31, 2024	Dec. 31, 2024
Weighted average of the equity volatility and implied volatility of the public warrants	66.00%	80.00%
Risk-free rate	5.26%	5.33%
Implied discount rate	15.00%	15.00%

X

- Definition

The element represents implied discount rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	niobf_
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Balance Type:	na
Period Type:	duration

X

- Definition

The element represents sharebased compensation arrangement by sharebased payment award fair value assumptions expected term2.

+ References

No definition available.

+ Details

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Namespace Prefix:	niobf_
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Balance Type:	na
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X

- 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

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Data Type:	xbrli:stringItemType
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X

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Period Type:	duration

X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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X

- Details

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X

- Details

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