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Benefit Plans - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Sep. 29, 2018 USD ($) installment shares | Sep. 30, 2017 USD ($) $ / shares shares | Oct. 01, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  |  | $ 18,000,000 | $ 17,400,000 | $ 19,300,000
Deferred tax benefits recognized related to equity awards |  |  | $ 8,200,000 | 0 | 0
Employer matching contribution, percent of eligible earnings (up to) |  |  | 4.00% |  |
Amount of contributions |  |  | $ 8,100,000 | 7,500,000 | 7,400,000
SERP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Deferred compensation liability |  |  | 11,700,000 | 12,000,000 |
Total value of assets held by trust |  |  | 11,700,000 | 12,000,000 |
Amount of contributions made to participants' SERP accounts |  |  | $ 1,000,000 | 1,200,000 | 500,000
Noncash settlement and re-investment amount due to change in trustee | $ 11,300,000 | $ 10,300,000 |  |  |
Other Postretirement Benefit Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Term of deferred compensation agreements |  |  | 15 years |  |
Deferred compensation liability |  |  | $ 200,000 | 300,000 |
Total value of assets held by trust |  |  | 10,000,000 | 9,700,000 |
Amount of payments made to participants |  |  | $ 100,000 | $ 400,000 | $ 800,000
PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period |  |  | 3 years |  |
Unrecognized compensation expense |  |  | $ 7,700,000 |  |
Unrecognized compensation expense, weighted average period of recognition |  |  | 1 year 11 months 12 days |  |
Payout, percent of shares granted |  |  | 100.00% |  |
Vested (in shares) | shares |  |  | 100,000 |  |
Granted (in shares) | shares |  |  | 100,000 | 100,000 | 100,000
PSUs | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 0.00% |  |
Number of shares that may be issued (in shares) | shares |  |  | 0 |  |
PSUs | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 200.00% |  |
Number of shares that may be issued (in shares) | shares |  |  | 400,000 |  |
PSUs | Vest Based on Market Condition - Relative TSR of Common Stock Compared to Companies in Russell 3000 Index |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 50.00% |  |
Payout, percent of shares granted |  |  | 146.00% |  |
Payout at target, TSR threshold percent of companies in Russell 3000 Index during performance period |  |  | 50.00% |  |
PSUs | Vest Based on Performance Condition - Three-Point Annual Average of Absolute Economic Return |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 50.00% |  |
Payout at target, average economic return threshold percentage over performance period |  |  | 2.50% |  |
Options and SARs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average fair value per share (in dollars per share) | $ / shares |  |  |  | $ 15.66 | $ 12.82
Fair value vested |  |  | $ 1,300,000 | $ 3,500,000 | $ 3,600,000
Total intrinsic value exercised |  |  | 10,900,000 | $ 10,200,000 | $ 7,400,000
Unrecognized compensation expense |  |  | $ 100,000 |  |
Unrecognized compensation expense, weighted average period of recognition |  |  | 1 month 2 days |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense |  |  | $ 16,700,000 |  |
Unrecognized compensation expense, weighted average period of recognition |  |  | 1 year 4 months 6 days |  |
2016 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum number of shares authorized under the plan (in shares) | shares |  |  | 3,200,000 |  |
2016 Plan | Cash Incentive Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long-term cash awards per employee that may be granted annually |  |  | $ 4,000,000 |  |
2016 Plan | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of annual vesting installments | installment |  |  | 2 |  |
Term |  |  | 10 years |  |
2016 Plan | SARs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of annual vesting installments | installment |  |  | 2 |  |
Term |  |  | 7 years |  |
2016 Plan | PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period |  |  | 3 years | 3 years |
2016 Plan | PSUs | Vest Based on Market Condition - Relative TSR of Common Stock Compared to Companies in Russell 3000 Index |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 50.00% |  |
2016 Plan | PSUs | Vest Based on Performance Condition - Three-Point Annual Average of Absolute Economic Return |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 50.00% |  |
2016 Plan | RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period |  |  | 3 years |  |

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