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138 - Disclosure - Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate for Income before Cumulative Effect of Change in Accounting Principle (Detail)
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TableReconciliation of Statutory Federal Tax Rate [Table]
Slicers (applies to each fact value in each table cell)
Reconciliation of Statutory Federal Tax Rate [Line Items]Period [Axis]
2011-10-01 - 2012-09-30
2010-10-01 - 2011-09-30
2009-10-01 - 2010-09-30
Statutory federal income tax rate
.350  
.350  
.350  
State income taxes, net of federal income tax benefit
.045  
.001  
(.019) 
Permanent items, principally a domestic production deduction
(.026) 
(.012) 
(.005) 
Change in valuation allowance
 
 
(.087) 
Other, net
(.003) 
(.005) 
 
Effective income tax rate
.366  
 
.334  
 
.239