Income Taxes	6 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is incorporated in Switzerland but operates in various countries with differing tax laws and rates. Further, a portion of the Company’s income before taxes and the provision for (benefit from) income taxes are generated outside of Switzerland. The income tax provision for the three months ended September 30, 2017 was $4.1 million based on an effective income tax rate of 6.8% of pre-tax income, compared to an income tax provision of $5.6 million based on an effective income tax rate of 10.6% of pre-tax income for the three months ended September 30, 2016. The income tax benefit for the six months ended September 30, 2017 was $1.3 million based on an effective income tax rate of (1.5)% of pre-tax income, compared to an income tax provision of $8.7 million based on an effective income tax rate of 11.1% for the six months ended September 30, 2016. The change in the effective income tax rate is primarily due to the recognition of excess tax benefits of $1.1 million and $11.0 million, respectively, in the three and six months ended September 30, 2017 after adoption of ASU 2016-09, compared to the same periods ended September 30, 2016. In the three and six months ended September 30, 2017, there was a discrete tax benefit of $0.7 million and $1.9 million, respectively, from the reversal of uncertain tax positions from the expiration of statutes of limitations. In the same periods ended September 30, 2016, the tax benefit from the reversal of uncertain tax positions from the expiration of statutes of limitations was $0.7 million and $1.8 million, respectively. As of September 30 and March 31, 2017, the total amount of unrecognized tax benefits due to uncertain tax positions was $68.7 million and $63.7 million, respectively, all of which would affect the effective income tax rate if recognized. The Company had $33.2 million in non-current income taxes payable and $1.9 million in current income taxes payable, including interest and penalties, related to its income tax liability for uncertain tax positions as of September 30, 2017, compared to $51.8 million in non-current income taxes payable and $1.5 million in current income taxes payable as of March 31, 2017. The Company anticipates a settlement of $1.9 million with the tax authorities in a foreign jurisdiction in the third quarter of fiscal year 2018. The Company recognizes interest and penalties related to unrecognized tax positions in income tax expense. As of September 30 and March 31, 2017, the Company had $3.2 million and $3.0 million, respectively, of accrued interest and penalties related to uncertain tax positions. Although the Company has adequately provided for uncertain tax positions, the provisions on these positions may change as revised estimates are made or the underlying matters are settled or otherwise resolved. During fiscal year 2018, the Company will continue to review its tax positions and provide for or reverse unrecognized tax benefits as issues arise. During the next twelve months, it is reasonably possible that the amount of unrecognized tax benefits could increase or decrease significantly due to changes in tax law in various jurisdictions, new tax audits and changes in the U.S. dollar as compared to other currencies. Excluding these factors, uncertain tax positions may decrease by as much as $7.8 million from the lapse of the statutes of limitations in various jurisdictions during the next twelve months.

Income Taxes

The Company is incorporated in Switzerland but operates in various countries with differing tax laws and rates. Further, a portion of the Company’s income before taxes and the provision for (benefit from) income taxes are generated outside of Switzerland.

The income tax provision for the three months ended September 30, 2017 was $4.1 million based on an effective income tax rate of 6.8% of pre-tax income, compared to an income tax provision of $5.6 million based on an effective income tax rate of 10.6% of pre-tax income for the three months ended September 30, 2016. The income tax benefit for the six months ended September 30, 2017 was $1.3 million based on an effective income tax rate of (1.5)% of pre-tax income, compared to an income tax provision of $8.7 million based on an effective income tax rate of 11.1% for the six months ended September 30, 2016.

The change in the effective income tax rate is primarily due to the recognition of excess tax benefits of $1.1 million and $11.0 million, respectively, in the three and six months ended September 30, 2017 after adoption of ASU 2016-09, compared to the same periods ended September 30, 2016. In the three and six months ended September 30, 2017, there was a discrete tax benefit of $0.7 million and $1.9 million, respectively, from the reversal of uncertain tax positions from the expiration of statutes of limitations. In the same periods ended September 30, 2016, the tax benefit from the reversal of uncertain tax positions from the expiration of statutes of limitations was $0.7 million and $1.8 million, respectively.

As of September 30 and March 31, 2017, the total amount of unrecognized tax benefits due to uncertain tax positions was $68.7 million and $63.7 million, respectively, all of which would affect the effective income tax rate if recognized.

The Company had $33.2 million in non-current income taxes payable and $1.9 million in current income taxes payable, including interest and penalties, related to its income tax liability for uncertain tax positions as of September 30, 2017, compared to $51.8 million in non-current income taxes payable and $1.5 million in current income taxes payable as of March 31, 2017. The Company anticipates a settlement of $1.9 million with the tax authorities in a foreign jurisdiction in the third quarter of fiscal year 2018.

The Company recognizes interest and penalties related to unrecognized tax positions in income tax expense. As of September 30 and March 31, 2017, the Company had $3.2 million and $3.0 million, respectively, of accrued interest and penalties related to uncertain tax positions.

Although the Company has adequately provided for uncertain tax positions, the provisions on these positions may change as revised estimates are made or the underlying matters are settled or otherwise resolved. During fiscal year 2018, the Company will continue to review its tax positions and provide for or reverse unrecognized tax benefits as issues arise. During the next twelve months, it is reasonably possible that the amount of unrecognized tax benefits could increase or decrease significantly due to changes in tax law in various jurisdictions, new tax audits and changes in the U.S. dollar as compared to other currencies. Excluding these factors, uncertain tax positions may decrease by as much as $7.8 million from the lapse of the statutes of limitations in various jurisdictions during the next twelve months.