Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net earnings	$ 180,838	$ 181,452	$ 165,844
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	69,036	75,235	77,353
Loss (gain) due to settlements or curtailments of postretirement plan (Note 17)	47	0	(7,539)
Impairment of long-lived asset held for sale (Note 9)	0	0	3,138
Net (gain) loss on sales of assets	(4,431)	(626)	166
Stock-based compensation	15,122	14,255	11,241
Deferred income taxes	(52,744)	15,504	(6,704)
Loss on derivatives reclassified from accumulated comprehensive earnings into earnings	21	99	99
Proceeds from formation of joint venture (Note 4)	250,000	0	0
Changes in operating assets and liabilities:
Accounts receivable	(9,190)	14,845	30,880
Inventories	(17,658)	(8,824)	(27,788)
Accounts payable and accrued liabilities	17,461	3,029	25,804
Current income taxes	(834)	(7,487)	9,378
Retirement benefit obligations	(3,416)	(4,537)	(2,788)
Other	(8,873)	13,045	(5,514)
Net cash provided by operating activities	435,379	295,990	273,570
Cash flows from investing activities:
Payments for purchase of property, plant and equipment	(175,692)	(286,612)	(207,106)
Proceeds from sale of assets	6,664	2,529	1,277
Purchases of short-term investments	4,918	0	0
Net cash used in investing activities	(173,946)	(284,083)	(205,829)
Cash flows from financing activities:
Cash dividends paid	(26,606)	(24,646)	(21,263)
Proceeds from sales of treasury stock	15,892	8,400	9,772
Payments for repurchases of common stock	(125,541)	(158,762)	(143,224)
Borrowings on revolving lines of credit and short-term borrowings	695,000	999,971	431,071
Payments on revolving lines of credit and short-term borrowings	(890,896)	(856,610)	(221,069)
Proceeds from issuance of long-term debt	179,308	0	250,000
Payments of long-term debt and capital lease obligations	(107,287)	0	(300,000)
Payments of debt financing costs	(863)	(2,359)	(1,297)
Net cash provided by (used in) financing activities	(260,993)	(34,006)	3,990
Effect of exchange rate changes on cash and cash equivalents	(1,552)	(10,986)	(5,000)
Net change in cash and cash equivalents	(1,112)	(33,085)	66,731
Cash and cash equivalents at beginning of period	82,202	115,287	48,556
Cash and cash equivalents at end of period	$ 81,090	$ 82,202	$ 115,287