Other Noncurrent Assets (Details 2) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Jun. 30, 2011 Y	May 31, 2012
Other Noncurrent Assets
Minimum expected revenue from the cargo handling system program		$ 300,000
Net costs capitalized associated with the engineering and development of the cargo system.		91,942
Exclusive distribution rights | Unison Industries
License Fees
Term of agreement (in years)	10
Expected revenue generated in the agreement		600,000
Amount agreed to be paid	20,000
Amount paid	7,000
Amount payable in each calendar year		1,300
License
License Fees
Amortization period (in years)		10
Current portion of the deferred payments		1,160
Long-term portion		$ 7,607