Commitments and Contingencies - Narrative (Details) - USD ($)	6 Months Ended
Sep. 30, 2017	Oct. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Contract termination, minimum period of written notice	30 days
Subsequent Event
Subsequent Event [Line Items]
Financing commitments		$ 140,000,000.0

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration