Income Taxes (Details) - USD ($) $ in Thousands  | 
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Oct. 01, 2018  | 
Mar. 31, 2019  | 
Sep. 30, 2018  | 
|
| Income Tax Contingency [Line Items] | |||
| Federal statutory tax rate, percent | 24.50% | ||
| Tax benefit related to TCJA | $ 10,100 | ||
| Deferred gain on sale | $ 3,704 | ||
| Discontinued Operations, Disposed of by Sale | Accounting Standards Update 2017-05 | |||
| Income Tax Contingency [Line Items] | |||
| Net adjustment to retained earnings | $ 14,601 | 
| X | ||||||||||
- Definition Tax Cuts And Jobs Act Of 2017 Incomplete Accounting Change In Tax Rate Deferred Tax Liability Provisional Income Tax Benefit No definition available. 
  | 
| X | ||||||||||
- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from a gain reported for tax purposes on sale and leaseback transactions in accordance with enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
  | 
| X | ||||||||||
- Details 
  | 
| X | ||||||||||
- Details 
  |