Fair Value Of Financial Assets And Liabilities (Assets And Liabilities Measured At Fair Value On A Nonrecurring Basis) (Details) (USD $)	12 Months Ended											12 Months Ended				12 Months Ended				12 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2013 Other intangible assets [Member]	Mar. 31, 2013 Other intangible assets [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Other intangible assets [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Hospital Piping Business [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2012 Long Lived Assets Held and Used [Member]	Mar. 31, 2012 Long Lived Assets Held and Used [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2012 Long Lived Assets Held and Used [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2012 Long Lived Assets Held and Used [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2012 Liquid CO2 Plant [Member]	Sep. 30, 2011 Liquid CO2 Plant [Member]	Mar. 31, 2012 Air Separation Unit [Member]	Mar. 31, 2013 Air Separation Unit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on a nonrecurring basis				$ 0	$ 0
Other intangible assets measured at fair value on a nonrecurring basis													0	0	535,000
Asset impairment charges	0	1,729,000	4,250,000									1,729,000				4,250,000				2,500,000		1,800,000
Long-lived assets measured at fair value on a nonrecurring basis																	0	0	9,165,000
Total assets measured at fair value on a non-recurring basis						0	0	0	0	535,000	9,165,000										8,800,000		400,000
Impairment of intangible assets (excluding goodwill)		$ 1,729,000