XML 55 R43.htm IDEA: XBRL DOCUMENT
v3.4.0.3

SUBSEQUENT EVENT (Details) - E175 [Member] - Subsequent Event [Member] | Apr. 11, 2016 aircraft
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Subsequent Event [Line Items] |
Committed to Purchase (in Aircraft) | 30
Options to Purchase Additional (in Aircraft) | 33
Horizon [Member] |
Subsequent Event [Line Items] |
Committed to Purchase (in Aircraft) | 30
Options to Purchase Additional (in Aircraft) | 33

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- Definition Unrecorded Unconditional Purchase Obligation, Option to Purchase Additional + References No definition available. + Details
Name: | alk_UnrecordedUnconditionalPurchaseObligationOptiontoPurchaseAdditional
Namespace Prefix: | alk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_AircraftTypeAxis=alk_E175Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=alk_HorizonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |