Commitment and Contingencies - Capital Commitments (Details) - berth	Sep. 30, 2020	Sep. 30, 2019
Long-term Purchase Commitment [Line Items]
Ship passenger capacity berths	52,530
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 Moon (1)
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
TUI Cruises | Hanseatic Spirit
Long-term Purchase Commitment [Line Items]
Ship passenger capacity berths	230