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Indebtedness (Schedule Of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Debt Instrument [Line Items]    
Short-term debt $ 416,314us-gaap_ShortTermBorrowings $ 387,866us-gaap_ShortTermBorrowings
Long-term debt 2,008,070us-gaap_LongTermDebt 2,107,096us-gaap_LongTermDebt
Less current portion of long-term debt (250,092)us-gaap_LongTermDebtCurrent (400,322)us-gaap_LongTermDebtCurrent
Long-term debt, excluding current portion 1,757,978us-gaap_LongTermDebtNoncurrent 1,706,774us-gaap_LongTermDebtNoncurrent
Total debt 2,424,384us-gaap_DebtLongtermAndShorttermCombinedAmount 2,494,962us-gaap_DebtLongtermAndShorttermCombinedAmount
Money market loans [Member]    
Debt Instrument [Line Items]    
Short-term debt 0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LoansPayableMember
0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LoansPayableMember
Commercial paper [Member]    
Debt Instrument [Line Items]    
Short-term debt 416,314us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
387,866us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
Trade receivables securitization [Member]    
Debt Instrument [Line Items]    
Long-term debt 295,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_TradeReceivablesSecuritizationMember
295,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_TradeReceivablesSecuritizationMember
Revolving credit borrowings - U.S. [Member]    
Debt Instrument [Line Items]    
Long-term debt 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_DomesticRevolvingCreditFacilityMember
0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_DomesticRevolvingCreditFacilityMember
Revolving credit borrowings - Multi-currency [Member]    
Debt Instrument [Line Items]    
Long-term debt 56,858us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_ForeignRevolvingCreditFacilityMember
54,230us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_ForeignRevolvingCreditFacilityMember
Revolving credit borrowings - France [Member]    
Debt Instrument [Line Items]    
Long-term debt 7,077us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_ForeignRevolvingCreditFacilityFranceMember
8,056us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_ForeignRevolvingCreditFacilityFranceMember
Senior notes, net [Member]    
Debt Instrument [Line Items]    
Long-term debt 1,648,513us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
1,748,774us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Other long-term debt [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 622us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_OtherLongTermDebtMember
$ 1,036us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= arg_OtherLongTermDebtMember