Fair Value Measurements - Fair Value Hierarchy for Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Apr. 01, 2017
Available for sale Securities Current
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available-for-sale Securities		$ 55,118	$ 10,688
Commercial Paper | Available for sale Securities Current
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available-for-sale Securities		29,411	10,688
Corporate Bonds | Available for sale Securities Current
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available-for-sale Securities		12,749
US Treasury Securities [Member] | Available for sale Securities Current
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Available-for-sale Securities		12,958
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred Compensation Plan Assets	[1]	2,048
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred Compensation Plan Assets	[1]	2,048
Fair Value, Measurements, Recurring | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		47,121	5,743
Fair Value, Measurements, Recurring | Short-term Investments [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		10,458	0
Fair Value, Measurements, Recurring | Short-term Investments [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		36,663	5,743
Fair Value, Measurements, Recurring | Short-term Investments [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets			0
Fair Value, Measurements, Recurring | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		3,058
Fair Value, Measurements, Recurring | Other Assets [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		3,058
Fair Value, Measurements, Recurring | Other Assets [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		0
Fair Value, Measurements, Recurring | Other Assets [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		0
Fair Value, Measurements, Recurring | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		49,749	27,340
Fair Value, Measurements, Recurring | Cash Equivalents [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		44,252	22,395
Fair Value, Measurements, Recurring | Cash Equivalents [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		5,497	4,945
Fair Value, Measurements, Recurring | Cash Equivalents [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets			0
Fair Value, Measurements, Recurring | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred Compensation Plan Assets	[1]	207
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred Compensation Plan Assets	[1]	207
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		2,213
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Other Assets [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		2,213
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Other Assets [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		0
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Other Assets [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		0
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		41,752	22,395
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Cash Equivalents [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		41,752	22,395
Fair Value, Measurements, Recurring | Commercial Paper | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		25,913	5,743
Fair Value, Measurements, Recurring | Commercial Paper | Short-term Investments [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		25,913	5,743
Fair Value, Measurements, Recurring | Commercial Paper | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		3,498	4,945
Fair Value, Measurements, Recurring | Commercial Paper | Cash Equivalents [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		3,498	4,945
Fair Value, Measurements, Recurring | Corporate Bonds | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		10,750
Fair Value, Measurements, Recurring | Corporate Bonds | Short-term Investments [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		10,750
Fair Value, Measurements, Recurring | Corporate Bonds | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		1,999
Fair Value, Measurements, Recurring | Corporate Bonds | Cash Equivalents [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		1,999
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(6)	(18)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Japanese Yen
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets			9
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(23)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | New Taiwan Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		3	20
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Korean Won
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets			39
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(12)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Euro
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		7
Financial and Nonfinancial Liabilities, Fair Value Disclosure			(96)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | British Pound
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		49
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Chinese Renminbi
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(29)	(5)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Singapore Dollar
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(1)	(1)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(6)	(18)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Level 2 | Japanese Yen
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets			9
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(23)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Level 2 | New Taiwan Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		3	20
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Level 2 | Korean Won
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets			39
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(12)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Level 2 | Euro
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		7
Financial and Nonfinancial Liabilities, Fair Value Disclosure			(96)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Level 2 | British Pound
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		49
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Level 2 | Chinese Renminbi
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(1)	(5)
Fair Value, Measurements, Recurring | Forward purchase or (sale) contracts | Level 2 | Singapore Dollar
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(29)	(1)
Fair Value, Measurements, Recurring | US Treasury Securities [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		10,458
Fair Value, Measurements, Recurring | US Treasury Securities [Member] | Short-term Investments [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		10,458
Fair Value, Measurements, Recurring | US Treasury Securities [Member] | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		2,500
Fair Value, Measurements, Recurring | US Treasury Securities [Member] | Cash Equivalents [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets		2,500
Fair Value, Measurements, Recurring | Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred Compensation Plan Assets	[1]	1,841
Fair Value, Measurements, Recurring | Exchange Traded Funds [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Deferred Compensation Plan Assets	[1]	$ 1,841
Fair Value, Measurements, Recurring | Exchange Traded Funds [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		845
Fair Value, Measurements, Recurring | Exchange Traded Funds [Member] | Other Assets [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		845
Fair Value, Measurements, Recurring | Exchange Traded Funds [Member] | Other Assets [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		0
Fair Value, Measurements, Recurring | Exchange Traded Funds [Member] | Other Assets [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of financial assets	[2]		$ 0

[1] *These investments represent assets held in trust for ESI's deferred compensation plan

[2] *These investments represent assets held in trust for ESI's deferred compensation plan