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Other Investments - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Nov. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity interest, percentage | 93.80% | 93.80% |  |
Aggregate cost of equity method investments | $ 51,500,000 |  |  |
Working capital adjustment relating to acquisition | 200,000 |  |  |
Pro-rata share of earnings from equity method investment |  | $ 1,594,000 | $ 270,000 |
Voting interest |  | 25.00% |  |
Equity Investment |  | $ 75,289,000 |  | $ 69,215,000
Purchase price description of minority interest under equity method |  | The purchase price is equal to the greater of: (a) (i) the product of the aggregate trailing 12-month revenues of the equity investment preceding the date of purchase, multiplied by (ii) a factor of 2.9 multiplied by (iii) a factor of 0.723, multiplied by (iv) the percentage interest owned by each minority equity holder and (b) $966,666. |  |
Minimum purchase price consideration of remaining minority interest under equity method |  | $ 966,666 |  |
Interest percentage in investment, accounted under cost method |  | 10.00% |  |
Investment accounted under cost method |  | $ 4,500,000 |  |
Other Long-term Liabilities | ASC 815-10, Derivatives and Hedging |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity method Investment, noncurrent liabilities | $ 2,200,000 |  |  |
Equity Investment |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity Investment |  | 57,400,000 |  | 56,300,000
Privately-held Company |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Pro-rata share of earnings from equity method investment |  | $ 1,100,000 |  |
Guangdong Fuxin Electronic Technology |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity interest, percentage |  | 20.20% |  |
Pro-rata share of earnings from equity method investment |  | $ 500,000 | $ 300,000 |
Total carrying value of equity method investment |  | $ 13,400,000 |  | $ 12,900,000

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