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Commitment and Contingencies - Capital Commitments (Details) - berth | Mar. 31, 2020 | Sep. 30, 2019
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Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 52,400 |
Royal Caribbean International | Wonder of the Seas |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 5,700 |
Royal Caribbean International | Oasis Class Ship |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 5,700 |
Royal Caribbean International | Odyssey of the Seas |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 4,200 |
Royal Caribbean International | Icon Class, Unnamed Ship One |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 5,600 |
Royal Caribbean International | Icon Class, Unnamed Ship Two |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 5,600 |
Royal Caribbean International | Icon Class, Unnamed Ship Three |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 5,600 |
Celebrity Cruises | Celebrity Beyond |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 3,250 |
Celebrity Cruises | Edge Class, Unnamed |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 3,250 |
Silversea Cruises | Silver Origin |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 100 |
Silversea Cruises | Silver Moon |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 550 |
Silversea Cruises | Silver Dawn |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 550 |
Silversea Cruises | Evolution Class, Unnamed Ship One |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 600 | 600
Silversea Cruises | Evolution Class, Unnamed Ship Two |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 600 | 600
TUI Cruises | Mein Schiff 7 |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 2,900 |
TUI Cruises | TUI Cruises, Unnamed Ship One |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 4,100 |
TUI Cruises | TUI Cruises, Unnamed Ship Two |  |
Long-term Purchase Commitment [Line Items] |  |
Ship passenger capacity berths | 4,100 |

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