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Shareholders' Equity	12 Months Ended
Shareholders' Equity	Mar. 31, 2018
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Share Repurchase Program On May 25, 2017, the Company’s Board of Directors authorized a $1.0 billion share repurchase program. During Fiscal 2018 and Fiscal 2017, the Company repurchased 7,700,959 shares and 21,756,353 shares, respectively, at a cost of $357.8 million and $1.000 billion, respectively, under its share-repurchase programs through open market transactions. As of March 31, 2018, the remaining availability under the Company’s share repurchase program was $642.2 million. Share repurchases may be made in open market or privately negotiated transactions, subject to market conditions, applicable legal requirements, trading transactions under the Company's insider trading policy and other relevant factors. The program may be suspended or discontinued at any time. The Company also has in place a “withhold to cover” repurchase program, which allows the Company to withhold ordinary shares from certain executive officers and directors to satisfy minimum tax withholding obligations relating to the vesting of their restricted share awards. During Fiscal 2018 and Fiscal 2017, the Company withheld 92,536 shares and 100,552 shares, respectively, with a fair value of $3.2 million and $4.8 million, respectively, in satisfaction of minimum tax withholding obligations relating to the vesting of restricted share awards.