| Component: (Network and Table) | |
|---|---|
| Network | 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) (http://www.0000889156.com/taxonomy/role/DisclosureReconciliationOfStatutoryFederalIncomeTaxRateToEffectiveIncomeTaxRateForIncomeBeforeCumulativeEffectOfChangeInAccountingPrinciple) |
| Table | Reconciliation of Statutory Federal Tax Rate [Table] |
| Reporting Entity [Axis] | 0000889156 (http://www.sec.gov/CIK) |
| Legal Entity [Axis] | Entity [Domain] |
| 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 |