Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 882,063	$ 833,797	$ 772,803
Other comprehensive income (loss) before reclassification	8,360	4,495
Amounts reclassified from other comprehensive loss to net income	10,216	(6,129)
Total other comprehensive income (loss)	18,576	(1,634)	11,856
Ending balance	882,095	882,063	833,797
Accumulated Other  Comprehensive  Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(39,677)	(38,043)	(49,899)
Ending balance	(21,101)	(39,677)	(38,043)
Retirement Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(10,696)	(12,800)
Other comprehensive income (loss) before reclassification	7,274	(1,979)
Amounts reclassified from other comprehensive loss to net income	18,182	4,083
Total other comprehensive income (loss)	25,456	2,104
Ending balance	14,760	(10,696)	(12,800)
Foreign Currency
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(32,785)	(32,352)
Other comprehensive income (loss) before reclassification	(1,157)	(433)
Amounts reclassified from other comprehensive loss to net income	0	0
Total other comprehensive income (loss)	(1,157)	(433)
Ending balance	(33,942)	(32,785)	(32,352)
Change in Derivatives Qualifying as Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	3,804	7,109
Other comprehensive income (loss) before reclassification	2,243	6,907
Amounts reclassified from other comprehensive loss to net income	(7,966)	(10,212)
Total other comprehensive income (loss)	(5,723)	(3,305)
Ending balance	$ (1,919)	$ 3,804	$ 7,109