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Notes Payable and Long Term Debt (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 09, 2016 USD ($) | Oct. 31, 2016 USD ($) | Oct. 31, 2016 CNY (¥) | Sep. 30, 2016 USD ($) | Mar. 31, 2016 JPY (¥) | Mar. 31, 2016 USD ($) | Oct. 15, 2015 USD ($) | Oct. 15, 2015 CNY (¥)
Second Amended and Restated Credit Agreement, as amended |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  | $ 255,000,000 |  |  |  |
Second Amended and Restated Credit Agreement, as amended | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, effective percentage |  |  |  | 2.03% |  |  |  |
Second Amended and Restated Credit Agreement, as amended | Prime Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, effective percentage |  |  |  | 4.00% |  |  |  |
Line of credit | Second Amended and Restated Credit Agreement, as amended | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term line of credit | $ 266,600,000 |  |  |  |  |  |  |
Line of credit | Japan Credit Facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current borrowing capacity |  |  |  |  | ¥ 5,500,000,000 | $ 54,000,000 |  |
Debt instrument, term |  |  |  |  | 6 months |  |  |
Line of credit | Japan Credit Facility | Tokyo Interbank Offered Rate (TIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, effective percentage |  |  |  | 0.46% |  |  |  |
Basis spread on variable rate |  |  |  | 0.40% |  |  |  |
Line of credit | Revolving credit facility | Second Amended and Restated Credit Agreement, as amended |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit amount outstanding |  |  |  | $ 600,000 |  |  |  |
Unused borrowing capacity |  |  |  | 144,400,000 |  |  |  |
Line of credit | Revolving credit facility | Second Amended and Restated Credit Agreement, as amended | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from lines of credit | 50,000,000 |  |  |  |  |  |  |
Remaining borrowing capacity | 133,400,000 |  |  |  |  |  |  |
Line of credit | Revolving credit facility | Second Amended China Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  |  | 13,500,000 |  |  |  |
Remaining borrowing capacity |  |  |  | 0 |  |  |  |
Additional available credit |  |  |  |  |  |  | $ 22,500,000 | ¥ 150,000,000
Capacity available for fully owned subsidiary |  |  |  |  |  |  | $ 7,500,000 | ¥ 50,000,000
Current line of credit |  |  |  | $ 22,500,000 |  |  |  |
Line of credit | Revolving credit facility | Second Amended China Credit Facility | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term line of credit | 16,500,000 |  |  |  |  |  |  |
Unused borrowing capacity | 28,500,000 |  |  |  |  |  |  |
Line of credit | Revolving credit facility | Second Amended China Credit Facility, as amended |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, effective percentage |  |  |  | 4.35% |  |  |  |
Line of credit | Revolving credit facility | Second Amended China Credit Facility, second amendment | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Increase to line of credit |  | $ 45,000,000 | ¥ 300,000,000 |  |  |  |  |
Line of credit | Revolving credit facility | Japan Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current line of credit |  |  |  | $ 0 |  |  |  |
Line of credit | Revolving credit facility | Japan Credit Facility | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from lines of credit | 21,098,000 |  |  |  |  |  |  |
Remaining borrowing capacity | 33,000,000 |  |  |  |  |  |  |
Current line of credit | $ 21,000,000 |  |  |  |  |  |  |

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