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Business Segment Information - Geographic Information Net Sales (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Net Sales | $ 236,658 | $ 199,766 | $ 193,949 | $ 182,597 | $ 231,086 | $ 192,223 | $ 174,778 | $ 173,495 | $ 812,970 | $ 771,582 | $ 685,740
United States |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 582,972 | 536,700 | 503,100
Asia |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 88,300 | 94,500 | 69,800
Europe |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 82,800 | 85,000 | 75,400
Canada |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 33,200 | 30,300 | 22,200
India |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 11,700 | 9,400 | 4,800
Other |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | $ 14,000 | $ 15,700 | $ 10,400

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