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Investments - Summary of Short and Long-term Investments (Detail) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Sep. 30, 2013
Schedule Of Investments [Line Items] |  |
Gross Unrealized Gains | $ 0 | $ 7,500
Gross Unrealized Losses | (283,376) | (41,643)
Fair Value | 51,563,458 | 10,698,271
Commercial notes (due within one year), amortized cost | 17,798,475 | 9,030,261
Commercial notes (due after one year through two years), amortized cost | 34,048,359 | 1,702,153
Total | 51,846,834 | 10,732,414
Commercial Notes Due Within One Year |  |
Schedule Of Investments [Line Items] |  |
Gross Unrealized Gains | 0 | 7,500
Gross Unrealized Losses | (115,181) | (39,281)
Fair Value | 17,683,294 | 8,998,480
Commercial Notes Due After One Year Through Two Years |  |
Schedule Of Investments [Line Items] |  |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (168,195) | (2,362)
Fair Value | $ 33,880,164 | $ 1,699,791

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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