Condensed Consolidating Financial Statements of Guarantors (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Cash (used in) provided by operating activities	$ 133,070	$ (40,089)
Cash flows from investing activities:
Purchases of property, plant and equipment	(19,090)	(21,247)
Proceeds from sale of property, plant and equipment	193
Net cash used in investing activities	(18,897)	(21,247)
Cash flows from financing activities:
Principal payments under long-term agreements	(67)	(132)
Payments for financing fees	(611)
Dividends paid	(38,750)	(21,313)
Net cash used in financing activities	(39,428)	(21,445)
Effect of exchange rate changes on cash	(2,186)	970
Net increase (decrease) in cash	72,559	(81,811)
Cash at beginning of period	139,488	198,561
Cash at end of period	212,047	116,750
Reportable Legal Entities | Parent Company
Cash flows from operating activities:
Cash (used in) provided by operating activities	(24,334)	(6,378)
Cash flows from investing activities:
Purchases of property, plant and equipment	(8,954)	(1,127)
Investment in subsidiary	7,000
Net cash used in investing activities	(15,954)	(1,127)
Cash flows from financing activities:
Payments for financing fees	(611)
Dividends paid	(38,750)	(21,313)
Intercompany accounts	138,949	(33,387)
Net cash used in financing activities	99,588	(54,700)
Net increase (decrease) in cash	59,300	(62,205)
Cash at beginning of period	77,550	81,356
Cash at end of period	136,850	19,151
Reportable Legal Entities | Guarantor Subsidiaries
Cash flows from operating activities:
Cash (used in) provided by operating activities	142,688	(54,362)
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,009)	(12,388)
Proceeds from sale of property, plant and equipment	193
Net cash used in investing activities	(816)	(12,388)
Cash flows from financing activities:
Intercompany accounts	(138,949)	33,387
Net cash used in financing activities	(138,949)	33,387
Net increase (decrease) in cash	2,923	(33,363)
Cash at beginning of period	751	35,357
Cash at end of period	3,674	1,994
Reportable Legal Entities | Non-Guarantor Subsidiaries
Cash flows from operating activities:
Cash (used in) provided by operating activities	23,505	23,876
Cash flows from investing activities:
Purchases of property, plant and equipment	(9,127)	(7,732)
Net cash used in investing activities	(9,127)	(7,732)
Cash flows from financing activities:
Principal payments under long-term agreements	(67)	(132)
Dividends paid	(8,789)	(3,225)
Capital contribution	7,000
Net cash used in financing activities	(1,856)	(3,357)
Effect of exchange rate changes on cash	(2,186)	970
Net increase (decrease) in cash	10,336	13,757
Cash at beginning of period	61,187	81,848
Cash at end of period	71,523	95,605
Eliminations
Cash flows from operating activities:
Cash (used in) provided by operating activities	(8,789)	(3,225)
Cash flows from investing activities:
Investment in subsidiary	(7,000)
Net cash used in investing activities	7,000
Cash flows from financing activities:
Dividends paid	8,789	3,225
Capital contribution	(7,000)
Net cash used in financing activities	$ 1,789	$ 3,225