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Investments - AFS, Debt Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | $ 1,292,500
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated fair value, available-for-sale securities | $ 0 | 1,292,500
Due in one year or less |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 246,500
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated fair value, available-for-sale securities |  | 246,500
Due after one year and through five years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 1,046,000
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated fair value, available-for-sale securities |  | 1,046,000
Due after five years and through ten years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 0
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated fair value, available-for-sale securities |  | 0
Due after ten years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 0
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated fair value, available-for-sale securities |  | 0
Total |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 1,292,500
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated fair value, available-for-sale securities |  | $ 1,292,500

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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