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Shareholders' Equity - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Sep. 30, 2018 | Jun. 24, 2018 | Jun. 25, 2017 | Apr. 23, 2014
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Payments of Dividends |  | $ 0 | $ 0 | $ 0 |
2014 Stock Repurchase Program [Member] |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 50,000,000
Stock repurchased during period, shares |  | 806,000 |  |  |
Stock repurchased, average price paid per share |  | $ 27.79 |  |  |
Stock repurchased during period, value |  | $ 22,409,000 |  |  |
Stock repurchase program, remaining amount available for repurchases |  | $ 27,603,000 |  |  |
2014 Stock Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program termination date | Oct. 31, 2018 |  |  |  |
2014 Stock Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchased during period, shares |  | 0 |  |  |
2018 Stock Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 50,000,000 |  |  |  |

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