Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Sep. 30, 2010	Jun. 30, 2010
Current assets:
Allowances for doubtful accounts on accounts receivable	$ 12,927	$ 7,072	$ 17,297
Accumulated depreciation and amortization on property, plant and equipment	$ 766,533	$ 734,739	$ 727,484
Common stockholder's equity:
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	26,781,785	26,781,785
Common stock, shares outstanding	26,781,785	26,781,785	26,781,785