Commitments and Contingencies - Additional Information (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2018 USD ($)
Commitments and Letters of Credit [Line Items]
Lease expiration date	2043-09
Future noncancelable sublease rental income	$ 11,800
Stand by letter of credit issued	20,300
Other contractual commitments	1,731,000
Long term employment commitment amount	1,350
Inventory purchase commitments
Commitments and Letters of Credit [Line Items]
Other contractual commitments	750,600
Debt obligations
Commitments and Letters of Credit [Line Items]
Other contractual commitments	874,400
Other contractual obligation
Commitments and Letters of Credit [Line Items]
Other contractual commitments	106,400
2017 Credit Facility
Commitments and Letters of Credit [Line Items]
Stand by letter of credit issued	$ 15,900