UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 60,450	$ 39,142
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,530	19,090
Provision for doubtful accounts	25	10
Share-based compensation expense	9,716	11,029
Deferred income tax expense	2,081	516
Non-cash foreign exchange (gain)/loss	470	(539)
(Gain) loss on disposal of property, plant and equipment	(621)	107
Impairment of assets	860	79
Other	(323)	657
Changes in operating assets and liabilities, excluding amounts related to acquisition:
Accounts receivable	(5,638)	(1,110)
Inventories	(247)	655
Prepaid expenses and other assets	(3,405)	(144)
Accounts payable	(1,186)	(2,945)
Accrued expenses, income taxes payable and other liabilities	8,304	(8,790)
Net cash provided by operating activities	90,016	57,757
Cash flows from investing activities:
Additions to property, plant and equipment	(15,901)	(13,836)
Proceeds from the sale of property, plant and equipment	637	17
Acquisition of business, net of cash acquired	0	(126,976)
Proceeds from the sale of investments	175	200
Net cash used in investing activities	(15,089)	(140,595)
Cash flows from financing activities:
Repayment of long-term debt	(7,656)	(6,563)
Repurchases of common stock	(5,882)	(27,855)
Net proceeds from issuance of stock	27,561	5,646
Dividends paid	(13,977)	(4,326)
Tax benefits associated with share-based compensation expense	5,826	770
Net cash provided by (used in) financing activities	5,872	(32,328)
Effect of exchange rate changes on cash	(4,376)	4,063
Increase (decrease) in cash and cash equivalents	76,423	(111,103)
Cash and cash equivalents at beginning of period	287,479	354,190
Cash and cash equivalents at end of period	363,902	243,087
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	$ 2,018	$ 701