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Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
Commitments [Line Items] |  |
Rental expense | $ 2.5 | $ 2.3
Vista, California |  |
Commitments [Line Items] |  |
Area of manufacturing facility leased | 162,000 |
Operating lease expiry date | 2014-03 |
Natural Alternatives International Europe Sa | Manno, Switzerland |  |
Commitments [Line Items] |  |
Area of manufacturing facility leased | 59,239 |
Operating lease expiry date | 2022-12 |
Operating lease effective date | Jan. 01, 2013 |

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- Details
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Namespace Prefix: | naii_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease Effective Date + References No definition available. + Details
Name: | naii_LeaseEffectiveDate
Namespace Prefix: | naii_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease Expiration, Month and Year + References No definition available. + Details
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Namespace Prefix: | naii_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
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- Definition Operating Lease Facility Area + References No definition available. + Details
Name: | naii_OperatingLeaseFacilityArea
Namespace Prefix: | naii_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration