CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Operating Activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 89,124	$ 92,886	$ 84,265
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, Depletion and Amortization	34,445	28,475	24,444
Provision for Doubtful Accounts	0	0	(1)
Gain (Loss) on Disposition of Property Plant Equipment	2,005	1,445	889
Increase (Decrease) in Deferred Income Taxes	2,972	2,362	3,049
Excess tax (benefit) deficiency on stock-based compensation	(1,206)	(1,489)	(1,336)
Equity in losses of unconsolidated affiliates	(94)	(9)	4
Share-based Compensation	5,969	6,451	6,302
Proceeds from the settlement of derivatives	8,543	0	0
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Other Operating Assets	(6,886)	(11,676)	6,307
Increase (Decrease) in Inventories	(40,792)	(8,970)	(16,370)
Increase (Decrease) in Accounts Payable	16,423	27,800	23,080
Net cash provided by (used in) operating activities	110,503	137,275	130,633
Additions to property and equipment	(89,185)	(118,101)	(69,927)
Deposits for land purchase option agreements	1,095	(850)	(1,599)
Proceeds from Sale of Property, Plant, and Equipment	368	142	264
Capital contribution to Panama joint venture	1,360	750	550
Net cash flows provided by (used in) investing activities	(89,082)	(119,559)	(71,812)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Issuance of Long-term Debt	52,977	41,942	3,979
Repayment of bank borrowings	(30,905)	(23,756)	(7,646)
Proceeds from short term bank borrowings	51,664	28,168	1,403
Repayment of short term bank borrowings	(42,143)	(28,172)	(1,403)
Settlement of Derivative Obligations	(24,000)	0	0
Payments of Dividends	(21,126)	(21,144)	(18,133)
Release of (addition to) restricted cash	26,920	8,000	2,000
Excess tax (deficiency) benefit on stock-based compensation	1,206	1,489	1,336
Purchase of treasury stock	(4,677)	(4,773)	(3,467)
Proceeds from Stock Options Exercised	49	118	125
Net cash provided by (used in) financing activities	9,965	1,872	(21,806)
Effect of Exchange Rate on Cash and Cash Equivalents	(11,412)	(4,364)	(6,389)
Cash and Cash Equivalents, Period Increase (Decrease)	19,974	15,224	30,626
Cash and cash equivalents at beginning of year	137,098	121,874	91,248
Cash and cash equivalents at end of year	157,072	137,098	121,874
Cash paid during the period for:
Interest Paid, Net	6,093	3,765	3,885
Income Taxes Paid, Net	$ 44,174	$ 44,261	$ 35,781