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Debt - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | ||||||||||
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Jul. 31, 2012
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Aug. 31, 2012
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Aug. 31, 2011
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Aug. 31, 2010
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Aug. 31, 2010
Loss on Interest Rate Swap Termination [Member]
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Jul. 31, 2012
2012 Agreement [Member]
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Aug. 31, 2012
2012 Agreement [Member]
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Aug. 31, 2012
2012 Agreement [Member]
Two Consecutive Quarters [Member]
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Aug. 31, 2012
2012 Agreement [Member]
Maximum [Member]
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Aug. 31, 2012
2012 Agreement [Member]
Maximum [Member]
Scenario, Forecast [Member]
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Aug. 31, 2012
2012 Agreement [Member]
Minimum [Member]
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Apr. 07, 2010
2010 Agreement [Member]
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Aug. 30, 2010
2010 Agreement [Member]
Loss on Extinguishment of Debt [Member]
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Aug. 30, 2010
2010 Agreement [Member]
Loss on Interest Rate Swap Termination [Member]
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Nov. 30, 2009
Iowa Department of Economic Development Loans [Member]
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Aug. 31, 2010
Iowa Department of Economic Development Loans [Member]
SecurityLoan
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Aug. 31, 2012
Iowa Department of Economic Development Loans [Member]
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| Proceeds from the issuance of preferred stock | $ 40,000,000 | ||||||||||||||||
| Maximum borrowing amount under amended and restated credit agreement | 130,000,000 | 60,000,000 | |||||||||||||||
| Scheduled principal payment | 0 | ||||||||||||||||
| Line of credit, expiration date | Jul. 09, 2017 | ||||||||||||||||
| Line of credit, amount outstanding | 82,600,000 | ||||||||||||||||
| Debt Instrument, Description of Variable Rate Basis over LIBOR (in percentage) | 4.00% | 2.00% | |||||||||||||||
| Covenant, total leverage ratio | 2.50 | 3.75 | |||||||||||||||
| Covenant, total funded debt ratio year two | 3.50 | ||||||||||||||||
| Covenant, total funded debt ratio year three | 3.25 | ||||||||||||||||
| Covenant, total funded debt ratio after year three | 3.0 | ||||||||||||||||
| Covenant, fixed coverage ratio | 1.35 | ||||||||||||||||
| Covenant, amount of annual capital expenditures permitted | 14,146,000 | 8,295,000 | 5,980,000 | 15,000,000 | |||||||||||||
| Covenant, dividend declaration permitted | 10,000,000 | ||||||||||||||||
| Dividend declared, Percentage of cash flow | 50.00% | ||||||||||||||||
| Unamortized transaction fees | 1,562,000 | 1,000,000 | 1,600,000 | ||||||||||||||
| Number of monthly payments | 60 equal monthly payments | ||||||||||||||||
| Non interest bearing loans | 1,000,000 | ||||||||||||||||
| Number of non interest bearing loans | 2 | ||||||||||||||||
| Loan period (in years) | 5 years | ||||||||||||||||
| Potentially forgivable loan amount | 1,000,000 | ||||||||||||||||
| Periodic repayments of loan | 16,667 | ||||||||||||||||
| Outstanding amount of IDED loans | 1,400,000 | ||||||||||||||||
| Capital lease obligations | 423,000 | 490,000 | |||||||||||||||
| Current portion of capital leases | $ 300,000 | ||||||||||||||||