UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 61,825	$ 60,450
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,527	19,530
Provision for doubtful accounts	80	25
Share-based compensation expense	14,269	9,716
Deemed repatriation transition tax	24,641	0
Deferred income tax expense	9,280	2,081
Non-cash foreign exchange (gain)	(1,340)	470
Loss (gain) on disposal of property, plant and equipment	45	(621)
Impairment of assets	0	860
Realized loss on the sale of available-for-sale securities	117	0
(Gain) on sale of assets	(956)	0
Other	4,030	(323)
Changes in operating assets and liabilities:
Accounts receivable	(9,612)	(5,638)
Inventories	(5,526)	(247)
Prepaid expenses and other assets	(12,482)	(3,405)
Accounts payable	473	(1,186)
Accrued expenses, income taxes payable and other liabilities	(375)	8,304
Net cash provided by operating activities	103,996	90,016
Cash flows from investing activities:
Additions to property, plant and equipment	(15,245)	(15,901)
Proceeds from the sale of property, plant and equipment	0	637
Proceeds from the sale of assets	3,027	0
Purchases of available-for-sale securities	(178,412)	0
Proceeds from the sale and maturities of available-for-sale securities	55,194	175
Settlement of net investment hedge	(9,882)	0
Net cash used in investing activities	(145,318)	(15,089)
Cash flows from financing activities:
Repayment of long-term debt	(144,375)	(7,656)
Repurchases of common stock	(33,072)	(5,882)
Proceeds from issuance of stock	20,297	27,561
Dividends paid	(20,507)	(13,977)
Tax benefits associated with share-based compensation expense	0	5,826
Net cash provided by (used in) financing activities	(177,657)	5,872
Effect of exchange rate changes on cash	7,213	(4,376)
(Decrease) increase in cash and cash equivalents	(211,766)	76,423
Cash and cash equivalents at beginning of period	397,890	287,479
Cash and cash equivalents at end of period	186,124	363,902
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	$ 1,588	$ 2,018