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Inventories, Net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Inventory [Line Items]    
Inventories, net $ 487,778 $ 478,149
Hardgoods [Member]
   
Inventory [Line Items]    
Inventories, net 321,179 313,127
Gases [Member]
   
Inventory [Line Items]    
Inventories, net $ 166,599 $ 165,022