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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | May 17, 2022
Significant Accounting Policies [Line Items] |  |  |  |
Allowance for doubtful accounts | $ 6,400 | $ 6,700 |  |
Bad debt expense | 200 | 300 | $ 300 |
Write-offs of accounts receivable | 600 | 600 | 100 |
Depreciable assets | $ 147,600 | 139,500 | 129,600 |
Basis of valuation | Property, Plant, and Equipment are stated at cost. |  |  |
Property, Plant and Equipment, Depreciation Methods1 | straight-line basis over the estimated useful lives |  |  |
Goodwill impairment more likely than not a likelihood as greater percentage of fair value of reportable unit exceeds its carrying value | 50.00% |  |  |
Intangible Assets, Amortization Expense | $ 8,400 | $ 7,900 | $ 6,800 |
Amortization expense, expected, for fiscal year 2026 | 10,300 |  |  |
Amortization expense, expected, for fiscal year 2027 | 10,100 |  |  |
Amortization expense, expected, for fiscal year 2028 | 10,000 |  |  |
Amortization expense, expected, for fiscal year 2029 | 9,800 |  |  |
Amortization expense, expected, for fiscal year 2030 | $ 9,800 |  |  |
Number of additional shares authorized to be repurchased |  |  |  | 7,500,000
Repurchase of shares | 1,214,173 | 1,863,534 | 3,075,788 |
Shares repurchased average price | $ 245.67 | $ 184.21 | $ 126.05 |
Stock repurchase remaining number of shares authorized to be repurchased | 4,669,497 |  |  |
Freight expense | $ 1,587,371 | $ 1,573,976 | $ 1,508,803 |
Accumulated other comprehensive loss | 3,125 | 3,373 |  |
Net of income taxes for accumulated other comprehensive loss | 1,000 |  |  |
Maintenance and repair expenses | $ 248,400 | $ 220,100 | $ 173,400 |
Stock options excluded from computation of diluted earnings per share | 4,404 | 16,609 | 52,375 |
Stock options, average exercise price per share | $ 240.32 | $ 133.91 | $ 127.06 |
Freight [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Freight expense | $ 211,200 | $ 215,300 | $ 229,600 |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Long term supply agreements term of termination notice period | 2 years |  |  |
Revenue from contract with customer collection terms | 30 days |  |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Long term supply agreements term of termination notice period | 3 years |  |  |
Revenue from contract with customer collection terms | 75 days |  |  |

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