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Summary of Significant Accounting Policies - Stock Split (Details) | Feb. 09, 2016 $ / shares | Oct. 29, 2017 $ / shares shares | Oct. 30, 2016 $ / shares shares | Jan. 27, 2016 shares | Jan. 26, 2016 $ / shares shares
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Before stock split |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.0293
Common stock, number of shares authorized | shares |  |  |  |  | 800,000,000
After stock split |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01465 |  |  |  |
Common stock, number of shares authorized | shares |  |  |  | 1,600,000,000 |
Common Stock |  |  |  |  |
Authorized stock split ratio | 2 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.01465 | $ 0.01465 |  |
Common stock, number of shares authorized | shares |  | 1,600,000,000 | 1,600,000,000 |  |

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