Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 12,534	$ 6,992	$ 13,517
Accumulated depreciation and amortization	$ 918,311	$ 886,268	$ 888,279
Common stock, par value	$ 2.25	$ 2.25	$ 2.25
Common stock, shares authorized	40,000,000	40,000,000	40,000,000
Common stock, shares issued	26,781,785.000	26,781,785.000	26,781,785.000
Common stock, shares outstanding	26,781,785.000	26,781,785.000	26,781,785.000