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Change in Rate Based on Leverage Ratio (Parenthetical) (Detail)
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Mar. 31, 2013
Maximum
Less than 3.00 to 1.00
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Mar. 31, 2013
Maximum
Greater than or equal to 3.00 to 1.00 but less than 4.00 to 1.00
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Mar. 31, 2013
Maximum
Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00
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Mar. 31, 2013
Maximum
Greater than or equal to 5.00 to 1.00 but less than 6.00 to 1.00
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Mar. 31, 2013
Minimum
Greater than or equal to 3.00 to 1.00 but less than 4.00 to 1.00
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Mar. 31, 2013
Minimum
Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00
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Mar. 31, 2013
Minimum
Greater than or equal to 5.00 to 1.00 but less than 6.00 to 1.00
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Mar. 31, 2013
Minimum
Greater than or equal to 6.00 to 1.00
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Sep. 30, 2013
Less than 3.25 to 1.00
Maximum
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Sep. 30, 2013
Greater than or equal to 3.25 to 1.00 but less than 4.50 to 1.00
Maximum
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Sep. 30, 2013
Greater than or equal to 3.25 to 1.00 but less than 4.50 to 1.00
Minimum
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Sep. 30, 2013
Greater than or equal to 4.50 to 1.00 but less than 6.00 to 1.00
Maximum
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Sep. 30, 2013
Greater than or equal to 4.50 to 1.00 but less than 6.00 to 1.00
Minimum
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Sep. 30, 2013
Greater than or equal to 6.00 to 1.00
Minimum
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Debt Instrument [Line Items] | ||||||||||||||
| Leverage ratio | 3.00% | 4.00% | 5.00% | 6.00% | 3.00% | 4.00% | 5.00% | 6.00% | 3.25% | 4.50% | 3.25% | 6.00% | 4.50% | 6.00% |