Business Combinations - Schedule Of Assets Acquired And Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020	Apr. 30, 2020
Fair value of assets acquired -
Goodwill	$ 115,315	$ 114,186
Exalenz [Member]
Fair value of assets acquired -
Cash			$ 5,006
Accounts receivable			637
Inventories			4,026
Other current assets			2,676
Property, plant and equipment			528
Goodwill			24,798
Other intangible assets (estimated useful life):
Right-of-use assets			1,311
Deferred tax assets, net			6,780
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			76,492
Fair value of liabilities assumed -
Accounts payable and accrued expenses			8,008
Long-term lease obligations			1,096
Long-term government grant obligations			10,792
Other non-current liabilities			291
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities			20,187
Total consideration			56,305
Exalenz [Member] | Technology-Based Intangible Assets [Member]
Other intangible assets (estimated useful life):
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			6,120
Exalenz [Member] | Noncompete Agreements [Member]
Other intangible assets (estimated useful life):
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			110
Exalenz [Member] | Trade Names [Member]
Other intangible assets (estimated useful life):
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			3,860
Exalenz [Member] | Customer Relationships [Member]
Other intangible assets (estimated useful life):
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 20,640