Short-Term Borrowings and Long-Term Debt Line of Credit (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Mar. 30, 2017
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 225,500
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	500,000	$ 500,000	$ 1,000,000
Debt Covenant, Cash Collateral Provision	$ 200,000	$ 200,000
Shanda Asset Management Investment Limited [Member]
Line of Credit Facility [Line Items]
Stock Repurchased During Period, Shares		5,568