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Short-Term Borrowings and Credit Lines (Narrative) (Details) - Mar. 31, 2021 - Japanese Subsidiary [Member] | USD ($) | JPY (¥)
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Unsecured And Uncommitted Credit Line1 |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ | $ 7,000,000.0 |
Unsecured And Uncommitted Credit Line2 |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | ¥ |  | ¥ 1,500,000,000
Unsecured And Uncommitted Credit Line3 |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | ¥ |  | ¥ 400,000,000.0
Unsecured And Uncommitted Credit Lines 1, 2, And 3 |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ | $ 24,200,000 |

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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 Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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