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Derivative Instruments (Details)	9 Months Ended
	Apr. 30, 2018 USD ($)	Apr. 30, 2018 NOK (kr)
Derivative Instruments, Gain (Loss) [Line Items]
Amount	$ 3,000,000	kr 23,958,220
Jun-18 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Settlement Date	Jun. 30, 2018	Jun. 30, 2018
Amount	$ 500,000	kr 4,004,545
Jul-18 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Settlement Date	Jul. 31, 2018	Jul. 31, 2018
Amount	$ 500,000	kr 3,999,545
Aug-18 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Settlement Date	Aug. 31, 2018	Aug. 31, 2018
Amount	$ 500,000	kr 3,994,495
Sep-18 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Settlement Date	Sep. 30, 2018	Sep. 30, 2018
Amount	$ 500,000	kr 3,989,945
Oct-18 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Settlement Date	Oct. 31, 2018	Oct. 31, 2018
Amount	$ 500,000	kr 3,986,095
Nov-18 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Settlement Date	Nov. 30, 2018	Nov. 30, 2018
Amount	$ 500,000	kr 3,983,595

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- 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.

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- Definition

Date the foreign currency exchange rate derivatives mature or expire, in CCYY-MM-DD format.

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- Definition

Amount of underlying refers to the price on the security, commodity, index, or other variable specified by the contract.

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