Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Feb. 28, 2015 |
Feb. 29, 2016 |
|
| Debt Instrument [Line Items] | ||
| Total | $ 337,848,000 | $ 326,982,000 |
| Less amount due within one year | (21,866,000) | (23,192,000) |
| Long-term debt, exculding current maturities | 315,982,000 | 303,790,000 |
| Senior Notes [Member] | Unsecured Senior Notes Due January 2021 [Member] | ||
| Debt Instrument [Line Items] | ||
| Total | 125,000,000 | 125,000,000 |
| Senior Notes [Member] | Unsecured Senior Notes Due March 2012 through March 2018 [Member] | ||
| Debt Instrument [Line Items] | ||
| Total | 57,143,000 | 42,857,000 |
| Annual installments | 14,285,714 | |
| Line of Credit [Member] | Line of Credit [Member] | ||
| Debt Instrument [Line Items] | ||
| Total | 90,080,000 | 101,000,000 |
| Term Note [Member] | Term Not Due in Quarterly Installments Beginning in June 2013 through March 2018 [Member] | ||
| Debt Instrument [Line Items] | ||
| Total | $ 65,625,000 | $ 58,125,000 |