Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity	$ 1,227,014,000	$ 1,170,971,000	$ 1,170,971,000	$ 1,101,623,000	$ 1,095,831,000
Reclassification from accumulated other comprehensive loss into earnings	0		0
Other comprehensive income (loss), cash flow hedge, reclassification tax	1,361,000	1,453,000
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity	(28,651,000)	(39,241,000)	(39,241,000)
Unrealized loss on interest rate swaps, net of tax of $1,361 and $1,453, respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity	(4,555,000)	(4,864,000)	(4,864,000)
Unrecognized net loss on pension plans, net of tax of $(17) and $(17), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity	(56,000)	(56,000)	(56,000)
Accumulated other comprehensive income, accumulated tax	(17,000)	(17,000)	(17,000)
Accumulated other comprehensive loss, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity	$ (33,262,000)	$ (44,161,000)	$ (44,161,000)	$ (25,971,000)	$ (25,747,000)