Contingencies and Legacy Environmental Commitments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended				1 Months Ended			3 Months Ended				3 Months Ended
	Jun. 30, 2012 Location	Jun. 30, 2011	Mar. 31, 2012	Mar. 31, 2013	Jun. 30, 2012 Four Environmental Proceedings [Member]	Jun. 30, 2012 Other Properties [Member]	Jul. 31, 2001 Glen Head, New York [Member]	Jun. 30, 2012 Glen Head, New York [Member]	Dec. 31, 2005 Glen Head, New York [Member]	Jun. 30, 2005 Federal Labs [Member]	Dec. 31, 2003 Federal Labs [Member]	Jun. 30, 1999 Federal Labs [Member]	Jun. 30, 2012 Federal Labs [Member]	Jun. 30, 2012 Federal Labs [Member] Minimum [Member]	Jun. 30, 2012 Federal Labs [Member] Maximum [Member]
Contingencies and Legacy Environmental Commitments (Textual) [Abstract]
Aggregate environmental liability	$ 13,397		$ 13,535		$ 100	$ 4,176		$ 3,369					$ 5,852
Property held for sale								3,800
Sale of environmental remediation property							4,000
Appraised value of property							3,300		4,200
Environmental costs	239	263	1,177								200
Additional environmental remediation expense											200
Percentage of environmental costs paid by federal government										45.00%		50.00%
Time frame for environmental liabilities	30 years													20 years	30 years
Cost-sharing related to environmental liabilities	1,471		1,500
Environmental costs, one year				$ 1,228
Number of locations for participating in environmental assessments and remediation work	9