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Stockholders' equity - Textual information (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Mar. 28, 2020	Sep. 28, 2019
Equity [Abstract]
Stock repurchase program, authorized value		$ 50.0
Purchase of treasury stock (in shares)	2,536,845
Purchase price of common stock	$ 33.2
Average price per share (in dollars per share)	$ 13.07
Remaining authorized repurchase amount	$ 16.8

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method.

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