Property, Plant and Equipment (Tables)

12 Months Ended

Mar. 31, 2021

Property Plant And Equipment [Abstract]

Composition of Assets Grouped by Major Classifications

a. Composition of assets grouped by major classifications are as follows:

	March 31,
	2021		2020
Cost:
Land	$	7,628	$	7,628
Buildings		190,617		187,570
Leasehold improvements		3,552		3,383
Machinery and equipment		219,210		212,480
Computer software and equipment		46,087		39,156
Motor vehicles		80		80
Furniture, fixtures and office equipment		15,542		15,047
		482,716		465,344
Accumulated depreciation and impairment charges:
Buildings	$	85,139	$	78,150
Leasehold improvements		2,084		1,847
Machinery and equipment		153,628		144,437
Computer software and equipment		25,445		20,857
Motor vehicles		80		80
Furniture, fixtures and office equipment		10,832		10,012
		277,208		255,383
Depreciated cost	$	205,508	$	209,961