| Component: (Network and Table) | |
|---|---|
| Network | 2407404 - Disclosure - Indebtedness (Maturities) (Details) (http://www.blackbox.com/role/IndebtednessMaturitiesDetails) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0000849547 (http://www.sec.gov/CIK) |
| Debt Disclosure [Abstract] | Period [Axis] | |
|---|---|---|
2016-03-31 | 2015-03-31 | |
Debt Disclosure [Abstract] | ||
Total Debt of Registrant, Maturities, Repayments of Principal, Fiscal Year Maturity [Abstract] | ||
2017 | ||
2018 | ||
2019 | ||
2020 | ||
2021 | ||
Total | 120,802,000 | 138,132,000 |