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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]
--- | --- | --- | --- | --- | ---
Beginning Balance, shares at Sep. 30, 2014 |  | 115,025 |  |  |
Beginning 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 from stock-based awards | 24 |  | 24 |  |
Net income (loss) | 47,557 |  |  | 47,557 |
Repurchases of common stock, shares |  | (2,728) |  |  |
Repurchases of common stock, value | (64,940) | $ (27) | (64,913) |  |
Unrealized loss on hedging instruments, net of tax | 0 |  |  |  |
Foreign currency translation adjustment | (47,177) |  |  |  | (47,177)
Unrealized loss on available-for-sale securities, net of tax | 0 |  |  |  |
Change in pension benefits, net of tax | 49,802 |  |  |  | 49,802
Ending Balance, shares at Sep. 30, 2015 |  | 113,745 |  |  |
Ending Balance, value at Sep. 30, 2015 | 860,171 | $ 1,137 | 1,553,390 | (602,614) | (91,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Common stock issued for employee stock-based awards, shares |  | 1,820 |  |  |
Common stock issued for employee stock-based awards, value | 21 | $ 18 | 3 |  |
Shares surrendered by employees to pay taxes related to stock-based awards, shares |  | (597) |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards, value | (20,939) | $ (5) | (20,934) |  |
Compensation expense from stock-based awards | 65,996 |  | 65,996 |  |
Excess tax benefits from stock-based awards | 93 |  | 93 |  |
Net income (loss) | (54,465) |  |  | (54,465) |
Unrealized loss on hedging instruments, net of tax | (1,244) |  |  |  | (1,244)
Foreign currency translation adjustment | 408 |  |  |  | 408
Unrealized loss on available-for-sale securities, net of tax | (122) |  |  |  | (122)
Change in pension benefits, net of tax | $ (7,253) |  |  |  | (7,253)
Ending Balance, shares at Sep. 30, 2016 | 114,968 | 114,968 |  |  |
Ending 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) |  |
Common stock issued for employee stock purchase plan, shares |  | 269 |  |  |
Common stock issued for employee stock purchase plan, value | 10,778 | $ 3 | 10,775 |  |
Compensation expense from stock-based awards | 76,708 |  | 76,708 |  |
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 hedging instruments, net of tax | (299) |  |  |  | (299)
Foreign currency translation adjustment | 16,593 |  |  |  | 16,593
Unrealized loss on available-for-sale 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 | 115,333 |  |  |
Ending Balance, value at Sep. 30, 2017 | $ 885,436 | $ 1,153 | $ 1,609,030 | $ (650,840) | $ (73,907)

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