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Restructuring and Other Special Charges, Net (Components of Restructuring) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Restructuring Charges [Abstract]      
Restructuring costs (benefits), net     $ (2,177)us-gaap_BusinessExitCosts1
Other related costs     8,537us-gaap_OtherRestructuringCosts
Intangible asset impairment charge     1,729us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Total restructuring and other special charges, net $ 0arg_RestructuringAndOtherSpecialChargesNet $ 0arg_RestructuringAndOtherSpecialChargesNet $ 8,089arg_RestructuringAndOtherSpecialChargesNet