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Income Taxes Reconciliation (Details) - USD ($) $ in Thousands |  | 4 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 22, 2017 | Apr. 30, 2018 | Jan. 31, 2018 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Income Taxes |  |  |  |  |  |
U.S. federal statutory income tax rate (as a percent) | 35.00% | 21.00% | 35.00% | 21.00% | 21.00% | 30.40%
State and local income taxes, net of federal benefit (as a percent) |  |  |  | (2.10%) | (2.20%) | (2.20%)
R&D and other tax credits (as a percent) |  |  |  | (6.80%) | (8.10%) | (7.00%)
Valuation allowance (as a percent) |  |  |  | 3.40% | 3.70% | 4.90%
Foreign rate differential |  |  |  |  |  | 0.10%
Return to provision adjustments (as a percent) |  |  |  | 0.10% | (0.30%) | (0.10%)
Permanent items (as a percent) |  |  |  | 0.70% | 0.80% | (2.70%)
Foreign derived intangible income (as a percent) |  |  |  | (3.90%) | (3.70%) |
Excess benefit of stock options (as a percent) |  |  |  | (1.50%) | (3.10%) | (4.40%)
Tax Act (as a percent) |  |  |  |  |  | 10.40%
Other (as a percent) |  |  |  | 0.20% | 1.10% | 0.60%
Effective income tax rate (as a percent) |  |  |  | 11.10% | 9.20% | 30.00%
Current: |  |  |  |  |  |
Federal |  |  |  | $ 3,005 | $ 1,953 | $ 6,010
State |  |  |  | 390 | 228 | 900
Current |  |  |  | 3,395 | 2,181 | 6,910
Deferred: |  |  |  |  |  |
Federal |  |  |  | 2,063 | 1,945 | 3,272
State |  |  |  | 421 | 551 | (330)
Foreign |  |  |  | (31) | (36) | (52)
Deferred |  |  |  | 2,453 | 2,460 | 2,890
Total income tax expense (benefit) |  |  |  | 5,848 | 4,641 | $ 9,800
Deferred income tax assets: |  |  |  |  |  |
Accrued expenses |  |  |  | 3,337 | 3,559 |
Stock based compensaton |  |  |  | 2,259 | 1,647 |
Allowances, reserves, and other |  |  |  | 1,784 | 1,579 |
Outside basis difference |  |  |  | 2,264 | 1,150 |
Unrealized loss on securities |  |  |  | 9 |  |
Net operating loss and credit carry-forwards |  |  |  | 12,832 | 13,208 |
Intangibles basis |  |  |  | 605 | 125 |
Lease liability |  |  |  | 2,282 |  |
Total deferred income tax assets |  |  |  | 25,372 | 21,268 |
Deferred income tax liabilities: |  |  |  |  |  |
Fixed asset basis |  |  |  | (1,218) | (425) |
Revenue recognition |  |  |  | (3,112) | (2,909) |
Right of use assets |  |  |  | (1,965) |  |
Total deferred income tax liabilities |  |  |  | (6,295) | (3,334) |
Valuation allowance |  |  |  | (14,149) | (11,278) |
Net deferred tax assets |  |  |  | $ 4,928 | $ 6,656 |

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