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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2017
Income Tax Disclosure [Abstract] |
Provision for Income Taxes | The provision for income taxes was as follows during fiscal 2017, 2016 and 2015:
| Year ended September 30,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Current: |  |  |  |  |
Federal | $ | 19,576 |  |  | $ | 50,631 |  |  | $ | 23,646 |
State | 1,055 |  |  | 2,900 |  |  | (5,381 | )
Foreign | 8,486 |  |  | 7,597 |  |  | 10,405 |
| 29,117 |  |  | 61,128 |  |  | 28,670 |
Deferred: |  |  |  |  |
Federal | (5,027 | ) |  | (23,592 | ) |  | (5,004 | )
State | (296 | ) |  | (225 | ) |  | 1,422 |
Foreign | (726 | ) |  | (2,190 | ) |  | (2,352 | )
| (6,049 | ) |  | (26,007 | ) |  | (5,934 | )
Total provision | $ | 23,068 |  |  | $ | 35,121 |  |  | $ | 22,736 |
Deferred Tax Assets and Liabilities | Deferred tax assets and liabilities at September 30, 2017 and 2016 were as follows:
| September 30,
| 2017 |  | 2016
| (In thousands)
Deferred tax assets: |  |  |
Net operating loss carryforward | $ | 16,765 |  |  | $ | 16,122 |
Foreign tax credit carryforward | 10,286 |  |  | 14,590 |
Research credit carryforward | 7,333 |  |  | 6,132 |
Accrued bonus | 14,468 |  |  | 13,807 |
Investments | 582 |  |  | 619 |
Accrued compensation | 1,585 |  |  | 1,328 |
Share-based compensation | 29,770 |  |  | 27,203 |
Deferred revenue | — |  |  | 1,467 |
Accrued lease costs | 3,026 |  |  | 3,406 |
Property and equipment | 3,476 |  |  | 3,348 |
Other | 8,630 |  |  | 7,728 |
| 95,921 |  |  | 95,750 |
Less valuation allowance | (17,657 | ) |  | (15,145 | )
Total deferred tax assets | 78,264 |  |  | 80,605 |
Deferred tax liabilities: |  |  |
Intangible assets | (25,346 | ) |  | (28,056 | )
Prepaid expense | (4,681 | ) |  | (3,959 | )
Deferred revenue | (41 | ) |  | — |
Other | (992 | ) |  | (992 | )
Total deferred tax liabilities | (31,060 | ) |  | (33,007 | )
Deferred tax assets, net | $ | 47,204 |  |  | $ | 47,598 |
Reconciliation Between Federal Statutory Income Tax Rate and Effective Tax Rate | A reconciliation of the provision for income taxes, with the amount computed by applying the U.S. federal statutory income tax rate (35% in fiscal 2017, 2016 and 2015) to income before provision for income taxes for fiscal 2017, 2016 and 2015 is shown below:
| Year Ended September 30,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Income tax provision at U.S. federal statutory rate | $ | 52,963 |  |  | $ | 50,599 |  |  | $ | 38,233 |
State income taxes, net of U.S. federal benefit | 2,193 |  |  | 2,244 |  |  | 1,719 |
Foreign tax rate differential | (1,761 | ) |  | (4,661 | ) |  | (5,279 | )
Intercompany interest | (477 | ) |  | (1,223 | ) |  | (1,260 | )
Research credits | (2,572 | ) |  | (4,398 | ) |  | (2,104 | )
Domestic production deduction | (3,075 | ) |  | (3,726 | ) |  | (1,607 | )
Amended Returns/Audit Settlements/Statute Expirations | (1,296 | ) |  | (248 | ) |  | (5,806 | )
Foreign | 744 |  |  | (1,702 | ) |  | (3,109 | )
Valuation allowance | 2,512 |  |  | 1,262 |  |  | 1,805 |
Foreign tax credit | (1,342 | ) |  | (3,286 | ) |  | (1,296 | )
Excess tax benefits relating to stock-based compensation | (24,746 | ) |  | — |  |  | — |
Other | (75 | ) |  | 260 |  |  | 1,440 |
Recorded income tax provision | $ | 23,068 |  |  | $ | 35,121 |  |  | $ | 22,736 |
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| Year Ended September 30,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Gross unrecognized tax benefits at beginning of year | $ | 6,799 |  |  | $ | 4,634 |  |  | $ | 4,554 |
Gross increases for tax positions in prior years | 57 |  |  | 1,004 |  |  | 1,725 |
Gross decreases for tax positions in prior years | (19 | ) |  | (117 | ) |  | (3 | )
Gross increases based on tax positions related to the current year | 1,291 |  |  | 1,310 |  |  | 582 |
Decreases for settlements and payments | (151 | ) |  | (32 | ) |  | (2,224 | )
Decreases due to statue expiration | (1,497 | ) |  | — |  |  | — |
Gross unrecognized tax benefits at end of year | $ | 6,480 |  |  | $ | 6,799 |  |  | $ | 4,634 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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