Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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Subsequent Events - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands					1 Months Ended				5 Months Ended		9 Months Ended
	Nov. 02, 2016 $ / shares	Aug. 03, 2016 $ / shares	May 04, 2016 $ / shares	Feb. 18, 2016 $ / shares	Mar. 31, 2017 JPY (¥)	Nov. 30, 2016 JPY (¥)	Oct. 31, 2016 JPY (¥)	Oct. 31, 2016 USD ($)	Mar. 31, 2017 JPY (¥)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Subsequent Event [Line Items]
Proceeds from sale of assets, net of cash transferred \| $											$ 828,197	$ 0
Quarterly cash dividend declared (in dollars per share)		$ 1.75	$ 1.75	$ 1.75
Subsequent event
Subsequent Event [Line Items]
Quarterly cash dividend declared (in dollars per share)	$ 1.75
Bit-isle \| Solar power assets \| Scenario, forecast
Subsequent Event [Line Items]
Proceeds from sale of assets, net of cash transferred					¥ 5,313,384	¥ 2,500,000			¥ 7,813,384	$ 74,540
Bit-isle \| Subsequent event \| Solar power assets
Subsequent Event [Line Items]
Proceeds from sale of assets, net of cash transferred							¥ 400,000	$ 3,816
Bit-isle \| Loans payable \| Subsequent event
Subsequent Event [Line Items]
Proceeds from issuance of long-term debt							¥ 47,500,000	$ 453,150