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Acquisition - Schedule of Preliminary Allocation of Cost of Acquisition to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 01, 2021
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Assets acquired: |  |
Goodwill | $ 22,823 |
Barber-Nichols, Inc. [Member] |  |
Assets acquired: |  |
Cash and cash equivalents |  | $ 1,587
Accounts receivable |  | 8,154
Unbilled revenue |  | 7,068
Inventory |  | 3,669
Other current assets |  | 409
Property, plant & equipment |  | 8,037
Operating lease asset |  | 9,026
Goodwill | $ 22,823 | 22,823
Total assets acquired |  | 93,973
Liabilities assumed: |  |
Accounts payable |  | 2,736
Accrued compensation |  | 1,341
Other current liabilities |  | 665
Customer deposits |  | 6,048
Operating lease liabilities |  | 9,066
Other long term liabilities |  | 2,103
Total liabilities assumed |  | 21,959
Purchase price |  | 72,014
Backlog [Member] | Barber-Nichols, Inc. [Member] |  |
Assets acquired: |  |
Intangibles |  | 3,900
Customer Relationships [Member] | Barber-Nichols, Inc. [Member] |  |
Assets acquired: |  |
Intangibles |  | 11,800
Technology and Technical Know How [Member] | Barber-Nichols, Inc. [Member] |  |
Assets acquired: |  |
Intangibles |  | 10,100
Tradename [Member] | Barber-Nichols, Inc. [Member] |  |
Assets acquired: |  |
Intangibles |  | $ 7,400

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