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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, 2015 |  | 113,745 |  |  |
Beginning 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 |  |  |
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | 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) |  |
Stock Issued During Period, Shares, New Issues |  | 10,582 |  |  |
Stock Issued During Period, Value, New Issues | 995,500 | $ 106 | 995,394 |  |
Common stock issued for employee stock purchase plan, shares |  | 292 |  |  |
Common stock issued for employee stock purchase plan, value | 15,654 | $ 2 | 15,652 |  |
Compensation expense from stock-based awards | 82,939 |  | 82,939 |  |
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 hedging instruments, net of tax | 1,928 |  |  |  | 1,928
Foreign currency translation adjustment | (11,767) |  |  |  | (11,767)
Unrealized loss on available-for-sale 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)

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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