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Quarterly Financial Information (Unaudited) | 12 Months Ended
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Sep. 30, 2018
Quarterly Financial Data [Abstract] |
Quarterly Financial Information (Unaudited) |
| 16. | Quarterly Financial Information (Unaudited)
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
(Dollars in thousands, except per share amounts) |  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 173,495 |  |  |  | 174,778 |  |  |  | 192,223 |  |  |  | 231,086 |
Net earnings |  |  | 34,671 |  |  |  | 9,994 |  |  |  | 19,019 |  |  |  | 28,452 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.34 |  |  |  | 0.39 |  |  |  | 0.73 |  |  |  | 1.10 |
Diluted |  |  | 1.33 |  |  |  | 0.38 |  |  |  | 0.73 |  |  |  | 1.09 |
Dividends declared per common share |  | $ | 0.08 |  |  |  | 0.08 |  |  |  | 0.08 |  |  |  | 0.08 |
Common Stock per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | $ | 65.95 |  |  |  | 66.80 |  |  |  | 60.25 |  |  |  | 70.20 |
Low |  |  | 51.55 |  |  |  | 57.15 |  |  |  | 54.35 |  |  |  | 57.00 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 146,368 |  |  |  | 161,178 |  |  |  | 171,189 |  |  |  | 207,005 |
Net earnings |  |  | 10,727 |  |  |  | 11,157 |  |  |  | 12,645 |  |  |  | 19,174 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.42 |  |  |  | 0.43 |  |  |  | 0.49 |  |  |  | 0.74 |
Diluted |  |  | 0.41 |  |  |  | 0.43 |  |  |  | 0.49 |  |  |  | 0.74 |
Dividends declared per common share |  | $ | 0.08 |  |  |  | 0.08 |  |  |  | 0.08 |  |  |  | 0.08 |
Common Stock per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  | $ | 58.75 |  |  |  | 58.95 |  |  |  | 61.40 |  |  |  | 63.80 |
Low |  |  | 42.95 |  |  |  | 51.80 |  |  |  | 55.15 |  |  |  | 50.30 |

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- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialDataAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
Name: | us-gaap_QuarterlyFinancialInformationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration