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The Incentive Stock Plans - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Feb. 28, 2013 Incentive Stock Plan 2011 [Member] | Sep. 30, 2014 Incentive Stock Plan 2011 [Member] | Feb. 28, 2013 Incentive Stock Plan 2011 [Member] Minimum [Member] | Feb. 28, 2013 Incentive Stock Plan 2011 [Member] Maximum [Member] | Sep. 30, 2014 Incentive Stock Plan 2007 [Member] | Sep. 30, 2014 Incentive Stock Plans [Member] | Sep. 30, 2013 Incentive Stock Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 0 |  |  |  | 2,000,000 | 1,200,456 | 2,200,456 |  |  |
Additional shares threshold |  |  |  | 1,000,000 |  |  |  |  |  |
Number of Common stock shares available |  |  |  |  |  |  |  | 200,456 |  |
Expiration of Plan 2011 |  |  |  |  | 2021-01 |  |  |  |  |
Contractual term of plan 2011 |  |  |  |  | 10 years |  |  |  |  |
Weighted average grant fair value of options granted | $ 6.23 | $ 4.49 | $ 4.30 |  |  |  |  |  |  |
Total intrinsic value of options exercised | $ 4,500,000 | $ 3,300,000 | $ 1,400,000 |  |  |  |  |  |  |
Weighted average period unrecognized compensation costs related to non-vested options |  |  |  |  |  |  |  |  | 2 years | 2 years
Unrecognized compensation costs related to non-vested options | 2,200,000 | 980,000 |  |  |  |  |  |  |  |
Fair value of options vested | $ 1,900,000 | $ 2,500,000 | $ 3,100,000 |  |  |  |  |  |  |

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- Definition Share-based compensation arrangement by share-based payment award, number of shares available 2007 plan. + References No definition available. + Details
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- Definition Stock incentive plan contractual term maximum. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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