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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Retirement Benefits [Abstract] |  |  |
Eligible employees contribution to 401(k) plan (up to 25%) | 25.00% |  |
Employer contributions into 401(k) plans | $ 8.8 | $ 8.4 | $ 7.3
Employee incentive plans expenses | $ 48.4 | $ 41.6 | $ 40.0

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