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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
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 | 0 | 1,467
Accrued lease costs | 3,026 | 3,406
Property and equipment | 3,476 | 3,348
Other | 8,630 | 7,728
Deferred tax assets, gross | 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) | 0
Other | (992) | (992)
Total deferred tax liabilities | (31,060) | (33,007)
Deferred tax assets, net | $ 47,204 | $ 47,598

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