Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Changes in the components of accumulated other comprehensive income (loss)
Balance	$ 397,441	$ 390,774
Reclassifications from OCI to:
Other income	(307)	(364)
Revenue	(301,064)	(319,024)
Costs of revenue	232,460	234,735
Selling, general and administrative expenses	61,449	70,861
Interest expense	5,299	4,908
Less: comprehensive income attributable to noncontrolling interest, net of tax		330
Other income (expense), net of tax	5,957	2,669
Balance	403,299	399,202
Investment securities, including noncontrolling interests
Changes in the components of accumulated other comprehensive income (loss)
OCI before reclassifications net of tax		1
Other Comprehensive Income (Loss), Tax
OCI before reclassifications, Tax	0	0
Investment securities, including noncontrolling interests | Other income (expense)
Other Comprehensive Income (Loss), Tax
Reclassifications from OCI, Tax	0	0
Investment securities, including noncontrolling interests | Reclassification Out Of Accumulated Other Comprehensive Income
Reclassifications from OCI to:
Other income		2
Investment securities, noncontrolling interests
Other Comprehensive Income (Loss), Tax
Noncontrolling interests, Tax	0	0
Accumulated Net Unrealized Investment Gain Loss
Changes in the components of accumulated other comprehensive income (loss)
Balance	12	12
Reclassifications from OCI to:
Comprehensive income (loss)		3
Balance	12	15
Other Comprehensive Income (Loss), Tax
Comprehensive income (loss), Tax	0	0
Currency Translation Adjustments, including noncontrolling interests
Reclassifications from OCI to:
Less : Noncontrolling interests, net of tax		(137)
Foreign currency translation noncontrolling interests
Changes in the components of accumulated other comprehensive income (loss)
OCI before reclassifications net of tax	2,065	(381)
Accumulated Translation Adjustment
Changes in the components of accumulated other comprehensive income (loss)
Balance	(71,207)	(57,354)
Reclassifications from OCI to:
Comprehensive income (loss)	2,065	(518)
Balance	(69,142)	(57,872)
Cash Flow Hedges, including noncontrolling interests.
Changes in the components of accumulated other comprehensive income (loss)
OCI before reclassifications net of tax	966	(202)
Other Comprehensive Income (Loss), Tax
OCI before reclassifications, Tax	263	(210)
Cash Flow Hedges, including noncontrolling interests. | Reclassification Out Of Accumulated Other Comprehensive Income
Reclassifications from OCI to:
Revenue		12
Costs of revenue	466	(328)
Selling, general and administrative expenses	182	(162)
Interest expense	523	(154)
Cash Flow Hedges, noncontrolling interests.
Reclassifications from OCI to:
Less : Noncontrolling interests, net of tax		(1)
Other Comprehensive Income (Loss), Tax
Noncontrolling interests, Tax	0	0
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges.
Changes in the components of accumulated other comprehensive income (loss)
Balance	(11,818)	39
Reclassifications from OCI to:
Comprehensive income (loss)	2,137	(835)
Balance	(9,681)	(796)
Other Comprehensive Income (Loss), Tax
Comprehensive income (loss), Tax	655	(373)
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges. | Revenue
Other Comprehensive Income (Loss), Tax
Reclassifications from OCI, Tax	0	6
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges. | Costs of revenue
Other Comprehensive Income (Loss), Tax
Reclassifications from OCI, Tax	147	(77)
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges. | Selling General And Administrative Expenses
Other Comprehensive Income (Loss), Tax
Reclassifications from OCI, Tax	58	(38)
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges. | Interest expenses
Other Comprehensive Income (Loss), Tax
Reclassifications from OCI, Tax	187	(54)
Benefit plans, including noncontrolling interests
Changes in the components of accumulated other comprehensive income (loss)
OCI before reclassifications net of tax	11	123
Reclassifications from OCI to:
Other adjustments	(38)	(3)
Other Comprehensive Income (Loss), Tax
OCI before reclassifications, Tax	0	0
Benefit plans, prior service credit (cost), including noncontrolling interests | Other income (expense)
Other Comprehensive Income (Loss), Tax
Reclassifications from OCI, Tax	0	0
Benefit plans, prior service credit (cost), including noncontrolling interests | Reclassification Out Of Accumulated Other Comprehensive Income
Reclassifications from OCI to:
Other income (expense), net of tax	10	6
Benefit plans, net actuarial gain (loss), including noncontrolling interest | Other income (expense)
Other Comprehensive Income (Loss), Tax
Reclassifications from OCI, Tax	0	0
Benefit plans, net actuarial gain (loss), including noncontrolling interest | Other adjustments
Other Comprehensive Income (Loss), Tax
Reclassifications from OCI, Tax	0	0
Benefit plans, net actuarial gain (loss), including noncontrolling interest | Reclassification Out Of Accumulated Other Comprehensive Income
Reclassifications from OCI to:
Other income (expense), net of tax	96	36
Benefit plans, noncontrolling interests
Reclassifications from OCI to:
Less : Noncontrolling interests, net of tax		(6)
Other Comprehensive Income (Loss), Tax
Noncontrolling interests, Tax	0	0
Accumulated Defined Benefit Plans Adjustment
Changes in the components of accumulated other comprehensive income (loss)
Balance	(2,242)	(2,084)
Reclassifications from OCI to:
Comprehensive income (loss)	79	156
Balance	(2,163)	(1,928)
Other Comprehensive Income (Loss), Tax
Comprehensive income (loss), Tax	0	0
Accumulated Other Comprehensive Income (Loss)
Changes in the components of accumulated other comprehensive income (loss)
Balance	(85,255)	(59,387)
Reclassifications from OCI to:
Balance	$ (80,974)	$ (60,581)