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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Income Taxes [Line Items] |  |
Net income | $ 1,570,000 | $ 4,158,000
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 | 1,300,000 |
Undistributed earnings | 11,400,000 |
State and Local Jurisdiction |  |
Income Taxes [Line Items] |  |
Net operating loss carry forward | $ 8,600,000 |
State and Local Jurisdiction | Minimum |  |
Income Taxes [Line Items] |  |
Tax loss carry forward expiry year | 2022 |

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