CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 9,703	$ 10,415
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,555	5,968
Provision for doubtful accounts	132	(23)
Share-based compensation expense	3,494	3,393
Deferred income tax expense (benefit)	2,998	(738)
Non-cash foreign exchange loss	1,278	12
Loss on disposal of property, plant and equipment	29	45
Other	(905)	(191)
Changes in operating assets and liabilities:
Accounts receivable	(12,350)	2,393
Inventories	1,693	(1,562)
Prepaid expenses and other assets	2,881	4,445
Accounts payable	(3,764)	101
Accrued expenses, income taxes payable and other liabilities	(4,541)	(13,307)
Net cash provided by operating activities	6,203	10,951
Cash flows from investing activities:
Additions to property, plant and equipment	(3,023)	(6,958)
Net cash used in investing activities	(3,023)	(6,958)
Cash flows from financing activities:
Repayment of long-term debt	(4,375)	0
Repurchases of common stock	(11,256)	(14,485)
Net proceeds from issuance of stock	4,238	1,026
Tax benefits associated with share-based compensation expense	591	367
Principal payments under capital lease obligations	(21)	(3)
Net cash used in financing activities	(10,823)	(13,095)
Effect of exchange rate changes on cash	(1,197)	184
Decrease in cash and cash equivalents	(8,840)	(8,918)
Cash and cash equivalents at beginning of period	178,459	302,546
Cash and cash equivalents at end of period	169,619	293,628
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 the period	1,727	3,224
Issuance of restricted stock	$ 5,358	$ 5,724