Condensed Consolidating Financial Statements of Guarantors (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Cash (used in) provided by operating activities			$ 286,035	$ 27,017
Cash flows from investing activities:
Purchases of property, plant and equipment	$ (37,626)	$ (25,192)	(83,592)	(72,436)
Proceeds from sale of property, plant and equipment			933
Proceeds from sale of powder facility			23,983
Net cash used in investing activities			(58,676)	(72,436)
Cash flows from financing activities:
Principal payments under long-term agreements			(778)	(298)
Payments for financing fees			(611)
Dividends paid			(78,398)	(60,063)
Net cash used in financing activities			(79,787)	(60,361)
Effect of exchange rate changes on cash			(4,152)	1,636
Net increase (decrease) in cash and cash equivalents			143,420	(104,144)
Cash and cash equivalents at beginning of period			139,488	198,561
Cash and cash equivalents at end of period	282,908	94,417	282,908	94,417
Reportable Legal Entities | Parent Company
Cash flows from operating activities:
Cash (used in) provided by operating activities			(1,062)	(36,434)
Cash flows from investing activities:
Purchases of property, plant and equipment			(27,245)	(17,979)
Investment in subsidiary			(7,000)	(6,500)
Net cash used in investing activities			(34,245)	(24,479)
Cash flows from financing activities:
Payments for financing fees			(611)
Dividends paid			(78,398)	(60,063)
Intercompany accounts			179,306	63,355
Net cash used in financing activities			100,297	3,292
Net increase (decrease) in cash and cash equivalents			64,990	(57,621)
Cash and cash equivalents at beginning of period			77,550	81,356
Cash and cash equivalents at end of period	142,540	23,735	142,540	23,735
Reportable Legal Entities | Guarantor Subsidiaries
Cash flows from operating activities:
Cash (used in) provided by operating activities			168,917	58,813
Cash flows from investing activities:
Purchases of property, plant and equipment			(13,839)	(25,615)
Proceeds from sale of property, plant and equipment			933
Proceeds from sale of powder facility			23,983
Net cash used in investing activities			11,077	(25,615)
Cash flows from financing activities:
Intercompany accounts			(179,306)	(68,555)
Net cash used in financing activities			(179,306)	(68,555)
Net increase (decrease) in cash and cash equivalents			688	(35,357)
Cash and cash equivalents at beginning of period			751	35,357
Cash and cash equivalents at end of period	1,439		1,439
Reportable Legal Entities | Non-Guarantor Subsidiaries
Cash flows from operating activities:
Cash (used in) provided by operating activities			155,346	26,137
Cash flows from investing activities:
Purchases of property, plant and equipment			(42,508)	(28,842)
Net cash used in investing activities			(42,508)	(28,842)
Cash flows from financing activities:
Principal payments under long-term agreements			(778)	(298)
Dividends paid			(37,166)	(16,843)
Capital contribution			7,000	6,500
Intercompany accounts				5,200
Net cash used in financing activities			(30,944)	(5,441)
Effect of exchange rate changes on cash			(4,152)	1,636
Net increase (decrease) in cash and cash equivalents			77,742	(6,510)
Cash and cash equivalents at beginning of period			61,187	81,848
Cash and cash equivalents at end of period	$ 138,929	75,338	138,929	75,338
Eliminations
Cash flows from operating activities:
Cash (used in) provided by operating activities			(37,166)	(21,499)
Cash flows from investing activities:
Investment in subsidiary			7,000	6,500
Net cash used in investing activities			7,000	6,500
Cash flows from financing activities:
Dividends paid			37,166	16,843
Capital contribution			(7,000)	(6,500)
Net cash used in financing activities			$ 30,166	10,343
Net increase (decrease) in cash and cash equivalents				(4,656)
Cash and cash equivalents at end of period		$ (4,656)		$ (4,656)