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Stockholders' equity | 12 Months Ended
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Sep. 29, 2018
Equity [Abstract] |
Stockholders' equity | Stockholders' equity Redeemable convertible preferred stock Upon the closing of the IPO, all outstanding shares of the Company's redeemable convertible preferred stock automatically converted into 32,482,590 shares of common stock on a one-for-one basis. Additionally, upon completion of the IPO, the Company's authorized capital stock consisted of 500,000,000 shares of common stock, $0.001 par value per share and 10,000,000 shares of "blank check" preferred stock, $0.001 par value per share. The following table summarizes the redeemable convertible preferred stock information (together, the "Preferred Stock") as of September 30, 2017:
(In thousands, except share amounts) |  |  |  |  |  |  |  |
|  | Authorized Shares |  | Issued and Outstanding Shares |  | Carrying Value |  | Liquidation Preference
Series A preferred stock |  | 10,035,000 |  |  | 10,005,000 |  |  | $ | 15,060 |  |  | $ | 15,008 |
Series B preferred stock |  | 3,881,250 |  |  | 3,730,000 |  |  | 5,926 |  |  | 5,968 |
Series C preferred stock |  | 11,700,000 |  |  | 11,688,766 |  |  | 26,556 |  |  | 25,000 |
Series D preferred stock |  | 7,058,824 |  |  | 7,058,824 |  |  | 42,799 |  |  | 45,000 |
Total |  | 32,675,074 |  |  | 32,482,590 |  |  | $ | 90,341 |  |  | $ | 90,976 |
Common and treasury stock During fiscal 2017, in an effort to facilitate the sale of common stock to new investors and provide liquidity for existing stockholders, the Company purchased 738,682 shares of common stock at the fair value of common stock at the date of exchange for an aggregate purchase price of $10.0 million and concurrent therewith, the Company issued 742,034 shares of common stock to two outside investors. The sale price to the outside investors was $13.56 per share, the fair value of common stock at the date of exchange, for total gross proceeds to the Company of $10.1 million.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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