Acquisitions (Details) (USD $)	3 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2011 Cornell Dubilier Foil, LLC item	Jun. 13, 2011 Cornell Dubilier Foil, LLC	Feb. 29, 2012 Niotan Incorporated	Feb. 21, 2012 Niotan Incorporated	Feb. 29, 2012 Niotan Incorporated Developed technology	Feb. 21, 2012 Niotan Incorporated Developed technology	Feb. 29, 2012 Niotan Incorporated Software	Feb. 21, 2012 Niotan Incorporated Software
Acquisitions
Purchase price				$ 15,000,000
Purchase price paid at closing (net of cash received)	1,439,000	11,584,000	11,600,000		30,500,000
Purchase price installment payable on each of the next two anniversaries of the acquisition closing date				1,000,000
Purchase price installment paid on the first anniversary of the acquisition closing date				1,000,000
Number of anniversaries from closing date on which installment payments are due			2
Additional deferred payments						45,000,000
Period of payment of additional deferred payments after the closing					30 months
Aggregate amount of quarterly royalty payments						10,000,000
Discounted purchase price
Cash at closing			12,000,000		30,656,000
Deferred payments (discounted)				2,815,000		41,938,000
Royalty payments (discounted)						8,975,000
Working capital adjustment				526,000		421,000
Discounted purchase price				15,341,000		81,990,000
Allocations of the aggregate purchase price
Cash				416,000		153,000
Accounts receivable				2,577,000		479,000
Prepaid expenses						186,000
Inventories				3,382,000		7,305,000
Other current assets				84,000
Property, plant and equipment				9,534,000		15,122,000
Goodwill				1,092,000		35,584,000
Intangible assets				1,660,000		22,420,000		22,300,000		120,000
Deferred income taxes						311,000
Other noncurrent assets						1,303,000
Current Liabilities				(3,404,000)		(873,000)
Total net assets acquired				$ 15,341,000		$ 81,990,000
Additional disclosures
Useful Life							18 years		4 years
Period of completion of development of assets	4 years