Benefit Plans Benefit Plans (Details) - USD ($)  | 
12 Months Ended | |
|---|---|---|
Mar. 31, 2020  | 
Mar. 31, 2019  | 
|
| Defined Contribution Plan Disclosure [Line Items] | ||
| Max dollar amount employer matches of the employee's contribution. | $ 500 | |
| Westell [Member] | ||
| Defined Contribution Plan Disclosure [Line Items] | ||
| Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 100.00% | |
| Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 100,000 | $ 100,000 | 
| 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 | ||||||||||
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. No definition available. 
  | 
| X | ||||||||||
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. No definition available. 
  | 
| X | ||||||||||
- Definition Max dollar amount employer matches of the employee's contribution. No definition available. 
  | 
| X | ||||||||||
- Details 
  |