CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 40,826	$ 51,662	$ 49,458
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,545	23,992	24,994
Provision for doubtful accounts	3,771	(18)	(113)
Share-based compensation expense	13,306	12,646	11,643
Deferred income tax expense (benefit)	(3,523)	4,934	(2,150)
Non-cash foreign exchange (gain)/loss	748	(212)	(498)
Loss on disposal of property, plant and equipment	247	140	107
Impairment of property, plant and equipment	968	198	158
Other	(925)	(723)	92
Changes in operating assets and liabilities:
Accounts Receivable	(4,622)	6,623	(1,985)
Inventories	(10,228)	(2,816)	(5,715)
Prepaid expenses and other assets	432	(658)	(6,021)
Accounts payable	2,026	(1,021)	1,555
Accrued expenses, income taxes payable and other liabilities	(164)	(1,181)	16,860
Net cash provided by operating activities	66,407	93,566	88,385
Cash flows from investing activities:
Additions to property, plant and equipment	(19,586)	(28,052)	(11,657)
Proceeds from the sale of property, plant and equipment	8	41	2
Purchase of intangible assets	(155)	(200)	(315)
Proceeds from the sale of investments	50	25	50
Net cash used in investing activities	(19,683)	(28,186)	(11,920)
Cash flows from financing activities:
Dividends paid	(347,140)	0	0
Issuance of long-term debt	175,000	0	0
Repayment of long-term debt	(2,188)	0	0
Repurchases of common stock	(34,537)	(55,499)	(25,764)
Net proceeds from issuance of stock	36,497	38,051	3,429
Tax benefits associated with share-based compensation expense	636	830	0
Principal payments under capital lease obligations	(11)	(1,296)	(1,210)
Net cash used in financing activities	(171,743)	(17,914)	(23,545)
Effect of exchange rate changes on cash	932	916	1,292
Increase (decrease) in cash	(124,087)	48,382	54,212
Cash and cash equivalents at beginning of year	302,546	254,164	199,952
Cash and cash equivalents at end of year	178,459	302,546	254,164
Supplemental disclosure of cash flow information:
Cash paid for income taxes	22,701	19,788	29,174
Cash paid for interest	2,336	158	257
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property, plant and equipment in accrued liabilities and accounts payable at the end of period	1,894	6,322	974
Issuance of restricted stock	6,374	6,774	4,985
Assets acquired under capital lease	$ 20	$ 0	$ 0