| Line Item | Jun 30, 2026 | Mar 31, 2026 | Jun 30, 2025 | Mar 31, 2025 |
|---|---|---|---|---|
| CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS | ||||
| Net revenue | ||||
| Operating expenses: | ||||
| Employee wages, benefits and taxes | ||||
| Maintenance, fuel and other direct expenses | ||||
| Insurance expense | ||||
| Other operating expenses | ||||
| Depreciation and amortization | ||||
| Impairment of assets held for sale and other investments | — | — | ||
| Acquisition, integration and other charges | ||||
| Total operating expenses | ||||
| % of revenue | 96.2% | 85.0% | ||
| Operating income | ||||
| % of revenue | 3.8% | 15.0% | ||
| Interest expense, net | ||||
| Equity in (earnings) losses of unconsolidated affiliates | ||||
| Other (income) loss, net | ||||
| Net income (loss) before income taxes | ||||
| Net income (loss) | ||||
| % of revenue | -1.9% | 7.3% | ||
| Net income (loss) available to common stockholders per share: | ||||
| Basic | ||||
| Diluted |