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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016	Apr. 01, 2016
Property, plant and equipment, accumulated depreciation	$ 128,519	$ 123,921	$ 122,369
Class A [Member]
Common stock, shares issued	8,782,779	8,778,028	8,808,905
Common stock, shares outstanding	8,782,779	8,778,028	8,808,905
Treasury stock, shares	79,071	64,323	33,599
Class B [Member]
Common stock, shares issued	1,212,006	1,212,006	1,212,382
Common stock, shares outstanding	1,212,006	1,212,006	1,212,382

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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