Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance, shares at Sep. 30, 2012		119,553
Balance, value at Sep. 30, 2012	$ 797,259	$ 1,196	$ 1,822,698	$ (954,134)	$ (72,501)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued for employee stock-based awards, shares		2,655
Common stock issued for employee stock-based awards, value	4,884	$ 27	4,857
Shares surrendered by employees to pay taxes related to stock-based awards, shares		(709)
Shares surrendered by employees to pay taxes related to stock-based awards, value	(14,996)	$ (7)	(14,989)
Compensation expense from stock-based awards	48,787		48,787
Excess tax benefits (tax shortfalls) from stock-based awards	307		307
Net income	$ 143,769			143,769
Repurchases of common stock, shares	(3,053)	(3,053)
Repurchases of common stock, value	$ (74,871)	$ (31)	(74,840)
Foreign currency translation adjustment	7,165				7,165
Change in pension benefits, net of tax	14,176				14,176
Balance, shares at Sep. 30, 2013		118,446
Balance, value at Sep. 30, 2013	926,480	$ 1,185	1,786,820	(810,365)	(51,160)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued for employee stock-based awards, shares		2,455
Common stock issued for employee stock-based awards, value	877	$ 24	853
Shares surrendered by employees to pay taxes related to stock-based awards, shares		(808)
Shares surrendered by employees to pay taxes related to stock-based awards, value	(26,857)	$ (8)	(26,849)
Compensation expense from stock-based awards	50,889		50,889
Excess tax benefits (tax shortfalls) from stock-based awards	10,428		10,428
Net income	$ 160,194			160,194
Repurchases of common stock, shares	(5,068)	(5,068)
Repurchases of common stock, value	$ (187,415)	$ (51)	(187,364)
Common stock repurchase holdback	(37,500)		(37,500)
Foreign currency translation adjustment	(24,069)				(24,069)
Change in pension benefits, net of tax	$ (19,138)				(19,138)
Balance, shares at Sep. 30, 2014	115,025	115,025
Balance, value at Sep. 30, 2014	$ 853,889	$ 1,150	1,597,277	(650,171)	(94,367)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued for employee stock-based awards, shares		2,212
Common stock issued for employee stock-based awards, value	41	$ 22	19
Shares surrendered by employees to pay taxes related to stock-based awards, shares		(764)
Shares surrendered by employees to pay taxes related to stock-based awards, value	(29,207)	$ (8)	(29,199)
Compensation expense from stock-based awards	50,182		50,182
Excess tax benefits (tax shortfalls) from stock-based awards	24		24
Net income	$ 47,557			47,557
Repurchases of common stock, shares	(2,728)	(2,728)
Repurchases of common stock, value	$ (64,940)	$ (27)	(64,913)
Common stock repurchase holdback	(64,940)
Foreign currency translation adjustment	(47,177)				(47,177)
Change in pension benefits, net of tax	$ 49,802				49,802
Balance, shares at Sep. 30, 2015	113,745	113,745
Balance, value at Sep. 30, 2015	$ 860,171	$ 1,137	$ 1,553,390	$ (602,614)	$ (91,742)