Leases - Operating and Finance Lease Liabilities (Details)	Apr. 30, 2020 USD ($)
Leases [Abstract]
Remaining portion of fiscal 2020	$ 2,666,000
Fiscal 2021	9,116,000
Fiscal 2022	7,730,000
Fiscal 2023	6,231,000
Fiscal 2024	4,878,000
Thereafter	7,013,000
Total future undiscounted cash flows	37,634,000
Less: Present value discount	3,289,000
Lease liabilities	$ 34,345,000
Weighted-average remaining lease terms	4 years 8 months 15 days
Weighted-average discount rate	4.04%

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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