Segment Information - Additional Information (Detail)	3 Months Ended	9 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Segment	Mar. 31, 2012
Segment Reporting Information [Line Items]
Number of segments			3
Percentage of net sales for products manufactured by NAIE in markets outside U.S	73.00%	69.00%	72.00%	66.00%

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration