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Income Taxes (Tables) | 12 Months Ended
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Mar. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of income (loss) before income taxes | Income from continuing operations before income taxes for the fiscal years 2017, 2016 and 2015 is summarized as follows (in thousands):
|  | Years Ended March 31,
|  | 2017 |  | 2016 |  | 2015
Swiss |  | $ | 161,544 |  |  | $ | 80,572 |  |  | $ | 119,460 |
Non-Swiss |  | 53,445 |  |  | 50,900 |  |  | 33,623 |
Income before taxes |  | $ | 214,989 |  |  | $ | 131,472 |  |  | $ | 153,083 |
Schedule of provision (benefit) for income taxes | The provision for (benefit from) income taxes is summarized as follows (in thousands):
|  | Years Ended March 31,
|  | 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |  |
Swiss |  | $ | 1,934 |  |  | $ | 1,668 |  |  | $ | 1,152 |
Non-Swiss |  | 9,774 |  |  | (2,582 | ) |  | 579 |
Deferred: |  |  |  |  |  |
Non-Swiss |  | (2,595 | ) |  | 4,024 |  |  | 2,923 |
Provision for income taxes |  | $ | 9,113 |  |  | $ | 3,110 |  |  | $ | 4,654 |
Schedule of difference between the provision (benefit) for income taxes and expected tax provision (benefit) at the statutory income tax rate | The difference between the provision for income taxes and the expected tax provision at the statutory income tax rate of 8.5% is reconciled below (in thousands):
|  | Years Ended March 31,
|  | 2017 |  | 2016 |  | 2015
Expected tax provision at statutory income tax rates |  | $ | 18,274 |  |  | $ | 11,175 |  |  | $ | 13,012 |
Income taxes at different rates |  | (5,247 | ) |  | (2,713 | ) |  | (4,299 | )
Research and development tax credits |  | (2,309 | ) |  | (1,619 | ) |  | (1,120 | )
Executive compensation |  | 654 |  |  | 864 |  |  | 1,557 |
Stock-based compensation |  | 1,794 |  |  | 1,446 |  |  | 2,261 |
Valuation allowance |  | 1,024 |  |  | 947 |  |  | 764 |
Restructuring charges / (credits) |  | 2 |  |  | 1,514 |  |  | (415 | )
Tax reserves (releases), net |  | (5,570 | ) |  | (8,761 | ) |  | (6,912 | )
Audit settlement |  | — |  |  | — |  |  | (837 | )
Other, net |  | 491 |  |  | 257 |  |  | 643 |
Provision for income taxes |  | $ | 9,113 |  |  | $ | 3,110 |  |  | $ | 4,654 |
Schedule of deferred income tax assets and liabilities | Deferred income tax assets and liabilities consist of the following (in thousands):
|  | March 31,
|  | 2017 |  | 2016
Deferred tax assets: |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 4,306 |  |  | $ | 7,136 |
Tax credit carryforwards |  | 5,825 |  |  | 2,981 |
Accruals |  | 41,570 |  |  | 36,365 |
Depreciation and amortization |  | 2,860 |  |  | 4,059 |
Share-based compensation |  | 11,846 |  |  | 12,890 |
Gross deferred tax assets |  | 66,407 |  |  | 63,431 |
Valuation allowance |  | (6,626 | ) |  | (5,338 | )
Gross deferred tax assets after valuation allowance |  | 59,781 |  |  | 58,093 |
Deferred tax liabilities: |  |  |  |  |  |
Acquired intangible assets and other |  | (4,267 | ) |  | (3,550 | )
Gross deferred tax liabilities |  | (4,267 | ) |  | (3,550 | )
Deferred tax assets, net |  | $ | 55,514 |  |  | $ | 54,543 |
Summary of aggregate changes in gross unrecognized tax benefits | The aggregate changes in gross unrecognized tax benefits in fiscal years 2017, 2016 and 2015 were as follows (in thousands):
March 31, 2014 |  | $ | 91,046 |
Lapse of statute of limitations |  | (14,071 | )
Settlements with tax authorities |  | (2,160 | )
Decreases in balances related to tax positions taken during prior years |  | (3,544 | )
Increases in balances related to tax positions taken during the year |  | 7,752 |
March 31, 2015 |  | $ | 79,023 |
Lapse of statute of limitations |  | (15,518 | )
Settlements with tax authorities |  | — |
Decreases in balances related to tax positions taken during prior years |  | (1,502 | )
Increases in balances related to tax positions taken during the year |  | 7,876 |
March 31, 2016 |  | $ | 69,879 |
Lapse of statute of limitations |  | (14,161 | )
Settlements with tax authorities |  | — |
Decreases in balances related to tax positions taken during prior years |  | (1,610 | )
Increases in balances related to tax positions taken during the year |  | 9,559 |
March 31, 2017 |  | $ | 63,667 |

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