Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended	1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 CALIFORNIA sqft	Jun. 30, 2013 Natural Alternatives International Europe Sa SWITZERLAND sqft	Jul. 31, 2013 Subsequent Event CALIFORNIA
Commitments [Line Items]
Area of manufacturing facility leased			162,000	59,239
Operating lease expiry date				2022-12	2024-03
Operating lease extended term					10 years
Rental expense	$ 2.2	$ 2.5