Changes in Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Nov. 30, 2012		Nov. 30, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Beginning of Period	$ 1,085,696		$ 1,101,236
Net Income (loss)	(1,001)	[1]	7,952	[1]
Net income (loss)	(1,443)		7,745
Other comprehensive loss, net of tax	(1,040)	[2]	(6,748)	[2]
Distributions to Noncontrolling Interests	(375)		(1,477)
Share Repurchases	0		(3,117)
Restricted Stock Withheld for Taxes	(1,104)		(840)
Share-based Compensation	4,210		5,210
Excess tax benefit (deficiency) from stock options exercised and restricted stock units vested	(681)		(413)
Cash Dividends (0.188 and 0.017 per share)	(4,952)		(463)
Dividends declared per common share	$ 0.188		$ 0.017
Stockholders' Equity, End of Period	1,080,753		1,102,166
Net loss attributable to redeemable noncontrolling interest	(442)		(207)
Foreign Currency Translation Adjustment Attributable to Redeemable Noncontrolling Interest	(174)		(377)
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Beginning of Period	1,080,583		1,094,712
Net income (loss)	(1,671)		7,018
Other comprehensive loss, net of tax	(1,040)	[2]	(6,748)	[2]
Distributions to Noncontrolling Interests	0		0
Share Repurchases	0		(3,117)
Restricted Stock Withheld for Taxes	(1,104)		(840)
Share-based Compensation	4,210		5,210
Excess tax benefit (deficiency) from stock options exercised and restricted stock units vested	(681)		(413)
Cash Dividends (0.188 and 0.017 per share)	(4,952)		(463)
Stockholders' Equity, End of Period	1,075,345		1,096,185
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Beginning of Period	5,113		6,524
Net Income (loss)	670	[1]	934	[1]
Other comprehensive loss, net of tax	0	[2]	0	[2]
Distributions to Noncontrolling Interests	(375)		(1,477)
Share Repurchases	0		0
Restricted Stock Withheld for Taxes	0		0
Share-based Compensation	0		0
Excess tax benefit (deficiency) from stock options exercised and restricted stock units vested	0		0
Cash Dividends (0.188 and 0.017 per share)	0		0
Stockholders' Equity, End of Period	$ 5,408		$ 5,981

[1] Net income attributable to noncontrolling interests for the three months ended November 30, 2012 and 2011 excludes net losses of $(442) thousand and $(207) thousand, respectively, allocable to the redeemable noncontrolling interest, which is reported in the mezzanine section of the Unaudited Condensed Consolidated Balance Sheets. See Note 8 - Redeemable Noncontrolling Interest.

[2] Other comprehensive loss, net of tax for the three months ended November 30, 2012 and 2011 excludes $(174) thousand and $(377) thousand, respectively, relating to foreign currency translation adjustments for the redeemable noncontrolling interest, which is reported in the mezzanine section of the Unaudited Condensed Consolidated Balance Sheets. See Note 8 - Redeemable Noncontrolling Interest.