Leases - (Details)	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term in years for operating leases	41 years
Oakwood Lease [Member]
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term in years for operating leases	17 years
Lessee, Operating Lease, Number Of Renewal Options	6
Lessee, operating lease, renewal term	5 years
Oxford Lease [Member]
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term in years for operating leases	41 years
Lessee, Operating Lease, Number Of Renewal Options	0
Other Leases [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	5 years
Fairfield Office Lease [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Barron Street Lease [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	5 years
Lessee, Operating Lease, Number Of Renewal Options	1
Lessee, Operating Lease, Lease Not yet Commenced, Renewal Term	5 years
Minimum [Member] | Other Leases [Member]
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term in years for operating leases	1 year
Maximum [Member] | Other Leases [Member]
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term in years for operating leases	6 years