Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Current assets:
Allowance for doubtful accounts	$ 5,599	$ 6,992
Common stockholder’s equity:
Common stock, par value (in usd per share)	$ 2.25	$ 2.25000
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	26,781,785	26,781,785.000
Common stock, shares outstanding	26,781,785	26,781,785.000