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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenues |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 1,160,083 | $ 1,000,146 | $ 934,983
Operating expenses: |  |  |
Cost of revenues | 336,845 | 312,898 | 287,607
Research and development | 149,478 | 128,383 | 110,870
Selling, general and administrative | 414,086 | 376,912 | 337,167
Amortization of intangible assets | 6,126 | 6,594 | 12,709
Restructuring and acquisition-related | 0 | 0 | 4,471
Total operating expenses | 906,535 | 824,787 | 752,824
Operating income | 253,548 | 175,359 | 182,159
Interest expense, net | (39,752) | (31,311) | (25,790)
Other income (expense), net | 2,276 | 12,884 | (86)
Income before income taxes | 216,072 | 156,932 | 156,283
Provision for income taxes | 23,948 | 30,450 | 22,869
Net income | 192,124 | 126,482 | 133,414
Other comprehensive income (loss): |  |  |
Foreign currency translation adjustments | (13,664) | (9,926) | 10,517
Comprehensive income | $ 178,460 | $ 116,556 | $ 143,931
Basic earnings per share (in dollars per share) | $ 6.63 | $ 4.26 | $ 4.32
Shares used in computing basic earnings per share (in shares) | 28,980 | 29,711 | 30,862
Diluted earnings per share (in dollars per share) | $ 6.34 | $ 4.06 | $ 4.14
Shares used in computing diluted earnings per share (in shares) | 30,294 | 31,180 | 32,245
Transactional and maintenance |  |  |
Revenues |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 860,948 | $ 750,603 | $ 633,927
Professional services |  |  |
Revenues |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 184,095 | 176,910 | 177,904
License |  |  |
Revenues |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 115,040 | $ 72,633 | $ 123,152

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