XML 70 R58.htm IDEA: XBRL DOCUMENT v3.19.2
Goodwill and Intangibles, net - Intangible Assets Subject to Amortization (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 417,467 $ 391,515
Accum. Amortization 307,145 293,071
Net 110,322 98,444
Customer Lists    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 381,890 358,776
Accum. Amortization 292,522 279,990
Net 89,368 78,786
Trade Names And Other Intangibles    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 35,577 32,739
Accum. Amortization 14,623 13,081
Net $ 20,954 $ 19,658