Intangible assets (Tables)

12 Months Ended

Mar. 31, 2019

Change in Carrying Value of Intangible Assets

The changes in the carrying value of intangible assets for the year ended March 31, 2018 are as follows:


Gross carrying value	Customer contracts			Customer relationships		Intellectual Property and other rights		Trade names			Technology			Leasehold benefits		Covenant not-to- compete		Service mark		Software		Total
Balance as at April 1, 2017	$	167,001		$	121,922	$	3,861	$	653		$	6,131		$	1,835	$	9,451		400	$	25,586	$	336,840
Additions		—			—		250		—			—			—		—		—		7,369		7,619
Translation adjustments		93			940		470		—			(6	)		—		10		—		894		2,401

Balance as at March 31, 2018	$	167,094		$	122,862	$	4,581	$	653		$	6,125		$	1,835	$	9,461	$	400	$	33,849	$	346,860

Accumulated amortization
Balance as at April 1, 2017	$	157,976		$	62,175	$	3,861	$	80		$	172		$	1,835	$	964	$	—	$	13,153	$	240,216
Amortization		2,725			3,700		74		236			790			—		2,310		—		5,670		15,505
Translation adjustments		(62	)		873		470		(1	)		(4	)		—		12		—		199		1,487

Balance as at March 31, 2018	$	160,639		$	66,748	$	4,405	$	315		$	958		$	1,835	$	3,286	$	—	$	19,022	$	257,208

Net carrying value as at March 31, 2018	$	6,455		$	56,114	$	176	$	338		$	5,167		$	—	$	6,175	$	400	$	14,827	$	89,652

The changes in the carrying value of intangible assets for the year ended March 31, 2019 are as follows:


Gross carrying value	Customer contracts			Customer relationships			Intellectual Property and other rights			Trade names			Technology			Leasehold benefits		Covenant not-to- compete			Service mark		Software			Total
Balance as at April 1, 2018	$	167,094		$	122,862		$	4,581		$	653		$	6,125		$	1,835	$	9,461			400	$	33,849		$	346,860
Additions		—			—			—			—			—			—		—			—		7,556			7,556
Translation adjustments		(5,146	)		(1,225	)		(298	)		(6	)		(73	)		—		(172	)		—		(1,742	)		(8,662	)

Balance as at March 31, 2019	$	161,948		$	121,637		$	4,283		$	647		$	6,052		$	1,835	$	9,289		$	400	$	39,663		$	345,754

Accumulated amortization
Balance as at April 1, 2018	$	160,639		$	66,748		$	4,405		$	315		$	958		$	1,835	$	3,286		$	—	$	19,022		$	257,208
Amortization		2,675			3,671			125			192			776			—		2,240			—		6,104			15,783
Translation adjustments		(4,940	)		(1,031	)		(298	)		(6	)		(17	)		—		(79	)		—		(1,054	)		(7,425	)

Balance as at March 31, 2019	$	158,374		$	69,338		$	4,232		$	501		$	1,717		$	1,835	$	5,447		$	—	$	24,072		$	265,566

Net carrying value as at March 31, 2019	$	3,574		$	52,249		$	51		$	146		$	4,335		$	—	$	3,842		$	400	$	15,591		$	80,188

Estimated Remaining Weighted Average Amortization Periods for Definite Lived Intangible Assets

As at March 31, 2019, the estimated remaining weighted average amortization periods for definite lived intangible assets are as follows:


	Balance life
	(in months)
Customer contracts		19
Customer relationships		196
Covenant not-to-compete		21
Trade names		10
Technology		68
Intellectual property and other rights		5
Software		20

Estimated Annual Amortization Expense

The estimated annual amortization expense based on remaining weighted average amortization periods for intangible assets and exchange rates, each as at March 31, 2019 are as follows:


	Amount
2020	$	15,716
2021		12,078
2022		7,000
2023		5,649
2024		4,398
Thereafter		34,947

	$	79,788	*

*	excludes service mark, as it has an indefinite useful life