Basis of Presentation - Summary of Impact of Adopting New Standards on Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Accounts receivable, net	$ 268,803		$ 267,665
Inventories	232,078		196,307
Prepaid expenses and other current assets	233,258		77,135
Other assets	744,740		686,134
Accrued liabilities	250,407		263,676
Retained earnings	252,107		$ 285,960
ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Accounts receivable, net		$ 262,001
Inventories		197,930
Prepaid expenses and other current assets		95,233
Other assets		703,872
Accrued liabilities		269,592
Retained earnings		311,839
Impact of ASC 606 [Member] | ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Accounts receivable, net	2,322	(5,664)
Inventories	(2,125)	1,623
Prepaid expenses and other current assets	(16,952)	18,098
Other assets	(23,865)	17,738
Accrued liabilities	(5,483)	5,916
Retained earnings	(35,136)	$ 25,879
Historical Accounting Method [Member] | ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Accounts receivable, net	271,125
Inventories	229,953
Prepaid expenses and other current assets	216,306
Other assets	720,875
Accrued liabilities	244,924
Retained earnings	$ 216,971