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Stockholders' Equity and Stock Compensation Plans (Tables) | 12 Months Ended
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Sep. 30, 2018
Stockholders' Equity Note [Abstract] |
Schedule of the stock-based compensation and related income tax benefits | The stock-based compensation and related income tax benefits were as follows:
| Fiscal Year Ended
| September 30, 2018 |  | October 1, 2017 |  | October 2, 2016
| (in thousands)
Total stock-based compensation | $ | 19,582 |  |  | $ | 13,450 |  |  | $ | 12,964 |
Income tax benefit related to stock-based compensation | (5,288 | ) |  | (4,715 | ) |  | (4,656 | )
Stock-based compensation, net of tax benefit | $ | 14,294 |  |  | $ | 8,735 |  |  | $ | 8,308 |
Schedule of stock option activity | Stock option activity for the fiscal year ended September 30, 2018 was as follows:
| Number of Options (in thousands) |  | Weighted- Average Exercise Price per Share |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding on October 1, 2017 | 1,753 |  |  | $ | 27.18 |  |  |  |  |  |
Granted | 171 |  |  | 48.01 |  |  |  |  |  |
Exercised | (549 | ) |  | 50.85 |  |  |  |  |  |
Forfeited | (20 | ) |  | 26.90 |  |  |  |  |  |
Outstanding at September 30, 2018 | 1,355 |  |  | 30.87 |  |  | 5.17 |  | $ | 50,689 |
Vested or expected to vest at September 30, 2018 | 1,330 |  |  | 30.94 |  |  | 5.13 |  | 49,694 |
Exercisable on September 30, 2018 | 929 |  |  | 27.21 |  |  | 3.93 |  | 38,152 |
Schedule of assumptions used in the calculation of the fair value of stock options using the Black-Scholes option pricing model | The fair value of our stock options was estimated on the date of grant using the Black-Scholes option pricing model. The following assumptions were used in the calculation:
| Fiscal Year Ended
| September 30, 2018 |  | October 1, 2017 |  | October 2, 2016
Dividend yield | 1.0% |  | 1.0% |  | 1.2%
Expected stock price volatility | 36.1% - 38.8% |  | 36.1% - 38.8% |  | 36.1% - 38.8%
Risk-free rate of return, annual | 1.7% - 2.9% |  | 1.7% - 1.9% |  | 1.6% - 1.8%
Schedule of RSU and PSU activity | A summary of the RSU and PSU activity under our stock plans is as follows:
| RSU |  | PSU
| Number of Shares (in thousands) |  | Weighted- Average Grant Date Fair Value per Share |  | Number of Shares (in thousands) |  | Weighted- Average Grant Date Fair Value per Share
Nonvested balance at September 27, 2015 | 483 |  |  | $ | 26.75 |  |  | 139 |  |  | $ | 31.66 |
Granted | 217 |  |  | 27.14 |  |  | 138 |  |  | 31.63 |
Vested | (180 | ) |  | 26.03 |  |  | — |  |  | — |
Forfeited | (21 | ) |  | 27.11 |  |  | — |  |  | — |
Nonvested balance at October 2, 2016 | 499 |  |  | 27.16 |  |  | 277 |  |  | 31.65 |
Granted | 226 |  |  | 41.00 |  |  | 99 |  |  | 48.36 |
Vested | (186 | ) |  | 26.98 |  |  | — |  |  | — |
Forfeited | (28 | ) |  | 30.15 |  |  | — |  |  | — |
Nonvested balance at October 1, 2017 | 511 |  |  | 33.19 |  |  | 376 |  |  | 36.05 |
Granted | 199 |  |  | 48.16 |  |  | 99 |  |  | 57.40 |
Vested | (184 | ) |  | 31.85 |  |  | (139 | ) |  | 31.66 |
Forfeited | (38 | ) |  | 36.39 |  |  | (13 | ) |  | 41.80 |
Nonvested balance at September 30, 2018 | 488 |  |  | 39.56 |  |  | 323 |  |  | 44.27 |
Summary of shares purchased, weighted-average purchase price, cash received, and the aggregate intrinsic value for shares purchased under the ESPP | The following table summarizes shares purchased, weighted-average purchase price, cash received and the aggregate intrinsic value for shares purchased under the ESPP:
| Fiscal Year Ended
| September 30, 2018 |  | October 1, 2017 |  | October 2, 2016
| (in thousands, except for purchase price)
Shares purchased | 141 |  |  | 190 |  |  | 209 |
Weighted-average purchase price | $ | 40.38 |  |  | $ | 26.02 |  |  | $ | 22.54 |
Cash received from exercise of purchase rights | $ | 5,727 |  |  | $ | 4,940 |  |  | $ | 4,707 |
Aggregate intrinsic value | $ | 337 |  |  | $ | — |  |  | $ | 710 |
Schedule of the assumptions used in the Black-Scholes option pricing model in estimating the grant date fair value of each award granted under the ESPP | The grant date fair value of each award granted under the ESPP was estimated using the Black-Scholes option pricing model with the following assumptions:
| Fiscal Year Ended
| September 30, 2018 |  | October 1, 2017 |  | October 2, 2016
Dividend yield | 1.0% |  | 1.0% |  | 1.3%
Expected stock price volatility | 24.0% |  | 22.4% |  | 23.7%
Risk-free rate of return, annual | 1.8% |  | 0.9% |  | 0.2%
Expected life (in years) | 1 |  | 1 |  | 1

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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