Consolidated Statements of Earnings and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Earnings and Comprehensive Income
Net sales	$ 225,862	$ 182,143	$ 437,033	$ 374,697
Cost of sales	144,554	118,068	281,625	237,350
Gross profit	81,308	64,075	155,408	137,347
Selling, general and administrative expenses	34,896	27,710	69,621	55,903
Income from operations	46,412	36,365	85,787	81,444
Interest expense, net	(4,691)	(5,831)	(16,068)	(12,345)
Other income (expense), net	1,889	(519)	1,734	(541)
Income before provision for income taxes	43,610	30,015	71,453	68,558
Provision for income taxes	(14,222)	(10,292)	(23,639)	(25,657)
Net income	29,388	19,723	47,814	42,901
Other Comprehensive Income, net	(3,927)	(282)	(5,441)	(313)
Comprehensive income	$ 25,461	$ 19,441	$ 42,373	$ 42,588
Net income per share:
Basic (in dollars per share)	$ 0.32	$ 0.21	$ 0.52	$ 0.47
Diluted (in dollars per share)	$ 0.31	$ 0.21	$ 0.50	$ 0.45
Weighted average shares outstanding:
Basic (in shares)	92,889	91,769	92,699	91,482
Diluted (in shares)	95,634	95,621	95,404	95,298