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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
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Jun. 30, 2012 Year | Jun. 30, 2011
Income Taxes [Line Items] |  |
Ownership change percentage that limits operating loss carry forwards | 50.00% |
Testing period for ownership change | 3 |
Net income | $ 4,158,000 | $ 5,086,000
Statutory federal income tax rate applied in the computation of income tax benefit | 34.00% | 34.00%
Natural Alternatives International Europe Sa |  |
Income Taxes [Line Items] |  |
Effective tax rate | 18.63% |
Net income | 1,600,000 |
Undistributed earnings | 10,100,000 |
State and Local Jurisdiction |  |
Income Taxes [Line Items] |  |
State tax net operating loss carry forward | $ 8,900,000 |
State and Local Jurisdiction | Minimum |  |
Income Taxes [Line Items] |  |
Tax loss carry forward expiry year | 2019 |

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- Definition The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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