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Component: (Network and Table)
Network
2405405 - Disclosure - Income Taxes (Effective Income Tax Rate Reconciliation) (Details)
(http://www.airgas.com/role/IncomeTaxesEffectiveIncomeTaxRateReconciliationDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000804212 (http://www.sec.gov/CIK)
Income Tax Expense (Benefit) [Abstract]Period [Axis]
2011-04-01 - 2012-03-31
2010-04-01 - 2011-03-31
2009-04-01 - 2010-03-31
Income Tax Expense (Benefit) [Abstract]
 
 
 
Taxes at U.S. federal statutory rate
0.35  
0.35  
0.35  
Increase in income taxes resulting from:
 
 
 
State income taxes, net of federal benefit
0.025  
0.034  
0.018  
Stock-based compensation expense
0.002  
0.001  
0.006  
State tax effect of corporate reorganization
(0.007) 
0  
0  
Domestic production activities deduction
(0.004) 
(0.007) 
(0.003) 
Other, net
(0.003) 
0.007  
0.004  
Effective income tax rate
0.363  
 
0.385  
 
0.375