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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] | Cash Flow Hedging [Member] | Cash Flow Hedging [Member] Accumulated Other Comprehensive Loss [Member] | Net Investment Hedging [Member] | Net Investment Hedging [Member] Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, shares at Sep. 30, 2016 |  | 114,968 |  |  |  |  |  |  |
Beginning Balance, value at Sep. 30, 2016 | $ 842,666 | $ 1,150 | $ 1,598,548 | $ (657,079) | $ (99,953) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Common stock issued for employee stock-based awards, shares |  | 1,586 |  |  |  |  |  |  |
Common stock issued for employee stock-based awards, value | 0 | $ 15 | (15) |  |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards, shares |  | (544) |  |  |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards, value | (26,654) | $ (5) | (26,649) |  |  |  |  |  |
Compensation expense from stock-based awards | 76,708 |  | 76,708 |  |  |  |  |  |
Common stock issued for employee stock purchase plan, shares |  | 269 |  |  |  |  |  |  |
Common stock issued for employee stock purchase plan, value | 10,778 | $ 3 | 10,775 |  |  |  |  |  |
Excess tax benefits from stock-based awards | 644 |  | 644 |  |  |  |  |  |
Net income (loss) | 6,239 |  |  | 6,239 |  |  |  |  |
Repurchases of common stock, shares |  | (946) |  |  |  |  |  |  |
Repurchases of common stock, value | (50,991) | $ (10) | (50,981) |  |  |  |  |  |
Unrealized loss on cash flow hedges, net of tax | (299) |  |  |  |  | $ (299) | $ (299) |  |
Foreign currency translation adjustment | 16,593 |  |  |  | 16,593 |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | (22) |  |  |  | (22) |  |  |  |
Change in pension benefits, net of tax | 9,774 |  |  |  | 9,774 |  |  |  |
Ending Balance, shares at Sep. 30, 2017 |  | 115,333 |  |  |  |  |  |  |
Ending Balance, value at Sep. 30, 2017 | 885,436 | $ 1,153 | 1,609,030 | (650,840) | (73,907) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle | Accounting Standards Update 2016-09 [Member] | 125 |  | 681 | (556) |  |  |  |  |
Common stock issued for employee stock-based awards, shares |  | 1,830 |  |  |  |  |  |  |
Common stock issued for employee stock-based awards, value | 0 | $ 18 | (18) |  |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards, shares |  | (664) |  |  |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards, value | (45,374) | $ (6) | (45,368) |  |  |  |  |  |
Common stock issued, shares |  | 10,582 |  |  |  |  |  |  |
Common stock issued, value | 995,500 | $ 106 | 995,394 |  |  |  |  |  |
Compensation expense from stock-based awards | 82,939 |  | 82,939 |  |  |  |  |  |
Common stock issued for employee stock purchase plan, shares |  | 292 |  |  |  |  |  |  |
Common stock issued for employee stock purchase plan, value | 15,654 | $ 2 | 15,652 |  |  |  |  |  |
Net income (loss) | 51,987 |  |  | 51,987 |  |  |  |  |
Repurchases of common stock, shares |  | (9,392) |  |  |  |  |  |  |
Repurchases of common stock, value | (1,100,000) | $ (93) | (1,099,907) |  |  |  |  |  |
Unrealized loss on cash flow hedges, net of tax | 1,928 |  |  |  |  | 1,928 | 1,928 |  |
Foreign currency translation adjustment | (11,767) |  |  |  | (11,767) |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | (269) |  |  |  | (269) |  |  |  |
Change in pension benefits, net of tax | $ (1,570) |  |  |  | (1,570) |  |  |  |
Ending Balance, shares at Sep. 30, 2018 | 117,981 | 117,981 |  |  |  |  |  |  |
Ending Balance, value at Sep. 30, 2018 | $ 874,589 | $ 1,180 | 1,558,403 | (599,409) | (85,585) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle | Accounting Standards Update 2016-16 [Member] | 72,261 |  |  | 72,261 |  |  |  |  |
Cumulative effect of new accounting principle | Accounting Standards Update 2014-09 [Member] | 363,218 |  |  | 363,218 |  |  |  |  |
Common stock issued for employee stock-based awards, shares |  | 1,495 |  |  |  |  |  |  |
Common stock issued for employee stock-based awards, value | 0 | $ 15 | (15) |  |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards, shares |  | (504) |  |  |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards, value | (44,366) | $ (5) | (44,361) |  |  |  |  |  |
Common stock issued, value | (140) |  | (140) |  |  |  |  |  |
Compensation expense from stock-based awards | 86,400 |  | 86,400 |  |  |  |  |  |
Common stock issued for employee stock purchase plan, shares |  | 275 |  |  |  |  |  |  |
Common stock issued for employee stock purchase plan, value | 17,615 | $ 3 | 17,612 |  |  |  |  |  |
Net income (loss) | (27,460) |  |  | (27,460) |  |  |  |  |
Repurchases of common stock, shares |  | (4,348) |  |  |  |  |  |  |
Repurchases of common stock, value | (114,994) | $ (44) | (114,950) |  |  |  |  |  |
Unrealized loss on cash flow hedges, net of tax | 4,702 |  |  |  |  | $ (385) | $ (385) | $ 5,087 | $ 5,087
Foreign currency translation adjustment | (24,755) |  |  |  | (24,755) |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | 530 |  |  |  | 530 |  |  |  |
Change in pension benefits, net of tax | $ (5,602) |  |  |  | (5,602) |  |  |  |
Ending Balance, shares at Sep. 30, 2019 | 114,899 | 114,899 |  |  |  |  |  |  |
Ending Balance, value at Sep. 30, 2019 | $ 1,201,998 | $ 1,149 | $ 1,502,949 | $ (191,390) | $ (110,710) |  |  |  |

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