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Commitments and Contingencies - Schedule of Purchase Commitments (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Long-term Purchase Commitment [Line Items]
Remainder of 2024	$ 17,218
2025	28,153
2026	13,504
2027	154
2028	70
Thereafter	18
Total	59,117
Cost of Revenue Commitments
Long-term Purchase Commitment [Line Items]
Remainder of 2024	14,539
2025	20,198
2026	8,128
2027	154
2028	70
Thereafter	18
Total	43,107
Operating Expense Commitments
Long-term Purchase Commitment [Line Items]
Remainder of 2024	2,679
2025	7,955
2026	5,376
2027	0
2028	0
Thereafter	0
Total	$ 16,010

X

- Definition

Purchase Obligation, Due After Fourth Year

+ References

No definition available.

+ Details

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Namespace Prefix:	fsly_
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X

- 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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X

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of purchase arrangement to be paid in fourth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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X

- Definition

Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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X

- Definition

Amount of purchase arrangement to be paid in second fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of purchase arrangement to be paid in third fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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X

- Definition

Amount of purchase arrangement to be paid in remainder of current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment.

+ References

No definition available.

+ Details

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- Details

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