GOODWILL AND OTHER INTANGIBLE ASSETS (Schedule Of Intangible Assets Gross Carrying Amounts And Accumulated Amortization) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Goodwill and Other Intangible Assets [Line Items]
Goodwill	$ 378,510	$ 377,879
Less: accumulated amortization	78,325	73,879
Patents [Member]
Goodwill and Other Intangible Assets [Line Items]
Gross carrying amount	928	928
Less: accumulated amortization	757	750
Net	171	178
Capitalized Software [Member]
Goodwill and Other Intangible Assets [Line Items]
Gross carrying amount	63,842	63,007
Less: accumulated amortization	36,081	34,382
Net	27,761	28,625
Customer relationships [Member]
Goodwill and Other Intangible Assets [Line Items]
Gross carrying amount	182,266	181,891
Less: accumulated amortization	39,922	37,364
Net	142,344	144,527
Other [Member]
Goodwill and Other Intangible Assets [Line Items]
Gross carrying amount	5,336	5,373
Less: accumulated amortization	1,565	1,383
Net	3,771	3,990
Trade names [Member]
Goodwill and Other Intangible Assets [Line Items]
Trade names	$ 173,531	$ 173,813