Commitments and Contingencies - Aircraft Purchase Commitments Activity (Details) - Future aircraft purchase commitments - aircraft	3 Months Ended
Jun. 30, 2017	Sep. 30, 2017
Unrecorded Unconditional Purchase Obligation
Aircraft purchase commitments, minimum quantity required		265
A321-200
Unrecorded Unconditional Purchase Obligation
Expanded agreement for additional aircraft	40
Aircraft purchase commitments, minimum quantity required		96
A350-900
Unrecorded Unconditional Purchase Obligation
Number of aircraft with deferred delivery	10
Aircraft purchase commitments, minimum quantity required	25	23
Maximum \| A350-900
Unrecorded Unconditional Purchase Obligation
Period of deferment	3 years
Minimum \| A350-900
Unrecorded Unconditional Purchase Obligation
Period of deferment	2 years

Unrecorded Unconditional Purchase Obligation, Period Of Deferment

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- Definition

Unrecorded Unconditional Purchase Obligation, Period Quantity Deferred

+ References

No definition available.

+ Details

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- Definition

Unrecorded Unconditional Purchase Obligation, Period Quantity Increase Decrease

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes.

+ References

No definition available.

+ Details

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- Details

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