Fair Value Measurements - Information about Financial Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | $ 666,759 | $ 662,389 |
Cash and cash equivalents | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 117,545 | 143,212 |
Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 540,795 | 510,372 |
Restricted cash | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 8,419 | 8,805 |
Money market funds | Cash and cash equivalents | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 103,471 | 133,239 |
Commercial paper | Cash and cash equivalents | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 14,074 | 9,973 |
Commercial paper | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 35,156 | 37,071 |
Certificates of deposit | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 20,535 | 24,726 |
Corporate notes and bonds | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 29,908 | 27,259 |
U.S. treasury securities | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 445,583 | 402,091 |
U.S. government agencies | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 9,613 | 19,225 |
Money market funds | Restricted cash | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 8,419 | 8,805 |
Level 1 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 557,473 | 544,135 |
Level 1 | Money market funds | Cash and cash equivalents | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 103,471 | 133,239 |
Level 1 | Commercial paper | Cash and cash equivalents | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 1 | Commercial paper | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 1 | Certificates of deposit | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 1 | Corporate notes and bonds | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 1 | U.S. treasury securities | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 445,583 | 402,091 |
Level 1 | U.S. government agencies | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 1 | Money market funds | Restricted cash | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 8,419 | 8,805 |
Level 2 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 109,286 | 118,254 |
Level 2 | Money market funds | Cash and cash equivalents | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 2 | Commercial paper | Cash and cash equivalents | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 14,074 | 9,973 |
Level 2 | Commercial paper | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 35,156 | 37,071 |
Level 2 | Certificates of deposit | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 20,535 | 24,726 |
Level 2 | Corporate notes and bonds | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 29,908 | 27,259 |
Level 2 | U.S. treasury securities | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 2 | U.S. government agencies | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 9,613 | 19,225 |
Level 2 | Money market funds | Restricted cash | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 3 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 3 | Money market funds | Cash and cash equivalents | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 3 | Commercial paper | Cash and cash equivalents | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 3 | Commercial paper | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 3 | Certificates of deposit | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 3 | Corporate notes and bonds | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 3 | U.S. treasury securities | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 3 | U.S. government agencies | Short-term investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | 0 | 0 |
Level 3 | Money market funds | Restricted cash | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets fair value | $ 0 | $ 0 |