Restatement of Previously Issued Consolidated Financial Statements (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Current Assets
Inventories	$ 809,050	$ 856,934
Deferred income taxes	25,651	26,242
Other current assets	50,401	64,761
Total current assets	1,360,325	1,263,126
Property, plant and equipment, net	608,027	597,202
Total assets	4,853,461	4,823,409
Liabilities and Stockholder's Equity
Deferred income taxes	691,809	707,962
Total liabilities	3,383,343	3,310,029
Accumulated deficit	(16,436)	(18,431)
Total stockholder's equity	1,470,118	1,513,380
Total liabilities and stockholder's equity	4,853,461	4,823,409
As Reported
Current Assets
Inventories	809,050	853,226
Deferred income taxes	26,900	28,915
Other current assets	50,401	61,509
Total current assets	1,361,574	1,258,839
Property, plant and equipment, net	614,566	597,202
Total assets	4,861,249	4,819,122
Liabilities and Stockholder's Equity
Deferred income taxes	695,569	707,962
Total liabilities	3,387,103	3,310,029
Accumulated deficit	(12,408)	(22,718)
Total stockholder's equity	1,474,146	1,509,093
Total liabilities and stockholder's equity	$ 4,861,249	$ 4,819,122