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Note 2. Summary of Significant Accounting Policies (Detail) - Estimated Useful Life of Intangible Assets
12 Months Ended
Sep. 30, 2012
Minimum [Member] | Noncompete Agreements [Member]
 
Estimated useful life of intangible assets 3 years
Minimum [Member] | Customer Relationships [Member]
 
Estimated useful life of intangible assets 5 years
Maximum [Member] | Noncompete Agreements [Member]
 
Estimated useful life of intangible assets 6 years
Maximum [Member] | Customer Relationships [Member]
 
Estimated useful life of intangible assets 6 years
Developed And Core Technology [Member]
 
Estimated useful life of intangible assets 3 years
Trademarks And Trade Names [Member]
 
Estimated useful life of intangible assets 10 years