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Commitments and Contingencies (Tables)
12 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Rental Commitments
Future minimum rental commitments as of September 30, 2018 for all non-cancelable operating leases are as follows:
 
Years ending September 30,
Gross
 
Sublease income
 
Net
2019
$
28,945

 
$
(927
)
 
$
28,018

2020
27,287

 
(364
)
 
26,923

2021
24,471

 
(79
)
 
24,392

2022
22,808

 
(81
)
 
22,727

2023
8,853

 
(21
)
 
8,832

Thereafter
40,622

 

 
40,622


$
152,986

 
$
(1,472
)
 
$
151,514