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Benefit Plans - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) installment $ / shares shares | Oct. 01, 2016 USD ($) $ / shares shares | Oct. 03, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | $ 17,400,000 | $ 19,300,000 | $ 13,300,000
Deferred tax benefits recognized related to equity awards |  | $ 0 |  |
Deferred tax benefits recognized related to equity awards |  |  | 0 | 0
Employer matching contribution, percent of eligible earnings (up to) |  | 4.00% |  |
Amount of contributions |  | $ 7,500,000 | 7,400,000 | 7,200,000
SERP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Deferred compensation liability |  | 12,000,000 | 9,800,000 |
Total value of assets held by trust |  | 12,000,000 | 9,500,000 |
Amount of contributions made to participants' SERP accounts |  | $ 1,200,000 | 500,000 | 500,000
Noncash settlement and re-investment amount due to change in trustee | $ 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 |  | $ 300,000 | 600,000 |
Total value of assets held by trust |  | 9,700,000 | 9,300,000 |
Amount of payments made to participants |  | $ 400,000 | $ 800,000 | $ 900,000
PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance period |  | 3 years |  |
Unrecognized compensation expense |  | $ 4,400,000 |  |
Unrecognized compensation expense, weighted average period of recognition |  | 2 years 1 month |  |
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 |  | 98.00% |  |
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 | $ 14.55
Fair value vested |  | $ 3,500,000 | $ 3,600,000 | $ 5,500,000
Total intrinsic value exercised |  | 10,200,000 | $ 7,400,000 | $ 7,700,000
Unrecognized compensation expense |  | $ 700,000 |  |
Unrecognized compensation expense, weighted average period of recognition |  | 8 months 24 days |  |
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense |  | $ 16,600,000 |  |
Unrecognized compensation expense, weighted average period of recognition |  | 1 year 6 months 10 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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