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Assets Held for Sale (Details)	1 Months Ended					3 Months Ended
Assets Held for Sale (Details)	Nov. 30, 2016 JPY (¥)	Nov. 30, 2016 USD ($)	Oct. 31, 2016 JPY (¥)	Oct. 31, 2016 USD ($)	Feb. 28, 2016 USD ($)	Mar. 31, 2017 JPY (¥)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains on asset sales							$ 0	$ 5,242,000
Assets held for sale							0	0
Liabilities held for sale							0	$ 0
Held-for-sale [Member] \| San Jose Land Parcel [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains on asset sales					$ 5,200,000
Solar Power Assets [Member] \| Bit-isle [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of property, plant and equipment	¥ 2,500,000,000	$ 22,100,000	¥ 400,000,000	$ 3,800,000		¥ 5,313,400,000	$ 47,800,000