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Investments - Auction rate securities (Details) - Auction rate securities | 12 Months Ended
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Apr. 30, 2019 item
Investments |
Number of available-for-sale securities | 2
Minimum |
Available For Sale Securities |
Maturity period of available-for-sale securities | 1 year
Maximum |
Available For Sale Securities |
Maturity period of available-for-sale securities | 16 years

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- Definition Represents the maturity period of available-for-sale securities. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition NA + References No definition available. + Details
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Namespace Prefix: | avav_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Data Type: | na
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Period Type: |

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- Details
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