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Stock Options and Restricted Stock Awards (Fair Values of Options, Black-Scholes Option-Pricing Model, Weighted-Average Assumptions) (Detail) (USD $)
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend yield 0.00% 0.00% 0.00%
Expected life in years 5 years 8 months 12 days 6 years 6 months 7 years
Risk-free interest rate 0.60% 0.94% 1.51%
Expected volatility 43.80% 47.00% 48.00%
Weighted average fair value of options granted $ 12.59 $ 8.78 $ 7.82